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## area of a 18 inch circle

3. (d)Diameter of a circle is always equal to two times of (r)radius. inches. This is the diameter of a circle that corresponds to the specified area. C x 34 = Show Your work WHY AM I DOING SCHOOL AT 2AM -.- DAAAAAANG, YALL SMART :O CAN U HELP WITH THIS ONE THOUGH? Lv 7. A circle of radius = 12 or diameter = 24 or circumference = 75.4 inches has an area of: 2.9187 × 10-7 square kilometers (km²); 0.29187 square meters (m²) 2918.7 square centimeters (cm²) The area of an oval is the longest diameter x the shortest x 0.7854. Area of Circle. An easy to use, free area calculator you can use to calculate the area of shapes like square, rectangle, triangle, circle, parallelogram, trapezoid, ellipse, octagon, and sector of a circle. What is 9²?--> 9 * 9 = 81 . Answer: 81π sq. (18(π) cm) = 2(π)r (18(π) cm)/(2(π)) = r. 9 cm = r. Now since we found that the value of radius r is 9 cm, we can solve for the area of the circle using the formula mentioned early: Area = (π)r². Since the formula for the area of a circle squares the radius, the area of the larger circle is always 4 (or 2 2) times the smaller circle.Think about it: You are doubling a number (which means ×2) and then squaring this (ie squaring 2) -- which leads to a new area that is four times the smaller one. If the diameter is 18 inches, what is the radius? But instead of a 16 inch diameter, it's now an 18 inch diameter circle. Answer Save. Given: radius of a circle = 15 inches Required to find - diameter Solution: d = 2r d = 2x15 d=30 Therefore the diameter of the given circle will be 30 inches. Let's do another example. 10950 Lin-Valle Dr. Saint Louis, MO 63123 - (800) 462-7447 - … You can enter the diameter and then compute radius and circumference in mils, inches, feet, yards, miles, millimeters, centimeters, meters and kilometers. 10 Answers. A circular pizza that is 18 inches in diameter is cut into 8 equal slices. Relevance. Determine the area of the shaded sector. Step-by-step explanation: New questions in Mathematics. 1 See answer nafissmith23 is waiting for your help. A circle has an area of M cm^2 and a circumference of N cm. Enter any of the four circle values, area, radius, diameter or circumference, click on Calculate and the other three values are returned in full (up to 18 decimal places) and maximum 3 decimal place rounded values. According to the formula, Perimeter= 2 xx (22)/7 xx r Taking the equation, Perimeter= 2 xx (22)/7 xx r rArr2 xx (22)/7 xx 9 rArr (396)/7 rArr 56.57142857 rArr 56.57 Let's hope this helps you:) Geometry . 18*pi or 18*3.141592=56.55. The circumference of a circle is calculated using the formula: 2 x π x radius, where π is a mathematical constant, equal to about 3.14159.It was originally defined as the ratio of a circle's circumference to its diameter (see second formula below on why) and appears in many formulas in mathematics, physics, and everyday life. Find the diameter of the circle 2 See answers tonb tonb The circumference is π times the diameter (2r). Solution for A circle has an 18-inch radius and a shaded sector with a central angle of 50°. Circumference of circle with radius 3 is 18.85 Circumference of circle with radius r is 2pir, where pi=3.1416. Basically, a sector is the portion of a circle. 0 1. And so when we think about area, we know that the area of a circle, the area of a circle is equal to pi times the radius of the circle squared. Jamayaa Jamayaa Answer: 81. A circle of radius = 6 or diameter = 12 or circumference = 37.7 inches has an area of: 7.29676 × 10-8 square kilometers (km²); 0.0729676 square meters (m²) 729.676 square centimeters (cm²) Henry knows that the circumference of a circle is 18 pi inches. Favorite Answer [1] Diameter is 18 units. That's the area of the semicircle. Therefore radius r=9 units. Enter the area contained within a circle. NLattig8833 NLattig8833 Answer: 31.8 in^2. r = 9. Thus, the area of a circle with a circumference of 18π centimeters is 81π squared centimeters. The diameter of the circle will be 30 inches. In the process, Diameter= 18, Radius(r)= (18)/2 :. Area of a triangle calculation using all different rules, side and height, SSS, ASA, SAS, SSA, etc. - 8929571 nafissmith23 nafissmith23 02/27/2018 Mathematics College Find the area of a circle circumscribed about an equilateral triangle whose side is 18 inches long. What is the area of a single slice? Using the Diameter Calculator. Radius= 9 Now, Circumference (Perimeter) = ? Well, the semicircle is half of the circle, so if I want the area of the semicircle, this is gonna be half this. A = 81π . Add your answer and earn points. The formula to find the area of the segment is given below. Plug that into the formula: A = π9² . The circumference of a 4-inch diameter circle is: about 12.57 inches. As such, circumference of circle with radius 3 is 2xx3.1416xx3 or 6xx3.1416=18.8496~=18.85 , What is the area of the circle? It’s the size of a 2-dimensional surface and is measured in square units, for example, square feet. 6 years ago. Area = 81π cm². With this semicircle area calculator, you can quickly find the area of half of a circle.What is more, the tool also doubles as a semicircle perimeter calculator, so inputting radius or diameter will help you find the basic features of the shape in the blink of an eye.In the article below, we provide the semicircle definition and explain how to find the perimeter and area of a semicircle. The circumference can be found … [6] 2020/10/08 18:09 Male / Under 20 years old / Elementary school/ Junior high-school student / Useful / Purpose of use Helped me with finding areas of a circle. d = 6 inches. The area, A of the circle with radius r is given by $$A$$ = $$π~r^2$$ Definition 3: The portion of the circle enclosed by two radii and the corresponding arc is known as the sector of a circle. Lv 5. alpha. P.S. The perimeter is measured in units such as centimeters,meters, kilometers, inches, feet, yards, and miles. 1 decade ago. 1 decade ago. If M/N=20, what is the radius of the... See all questions in Connection to Areas The area is measured in units such as square centimeters $(cm^2)$, square meters $(m^2)$, square kilometers $(km^2)$ etc. musiclover10045 musiclover10045 circumference = PI x D 18.84 = PI x D . (diameter x pi = circumference). Area=Pi*r^2 =3.14*81 =254.34 sq units. Circumference The distance around the outward boundary of a circle, expressed as a linear unit of measurement (millimeters, inches, etc.). 2 See answers michellehu8888 michellehu8888 The area of the circle is 81 pi inches. So instead of four pi, it is going to be two pi square units. Times the radius of the circle squared, and you say, well they gave us the diameter, what is the radius? First we need to know that the area of a circle is a function of the radius. Rounded, the answer is 6.00 inches. The formula for the area of a circle is: A = πr² . The formula for the area of a sector is (angle / 360) x π x radius 2.The figure below illustrates the measurement: As you can easily see, it is quite similar to that of a circle, but modified to account for the fact that a sector is just a part of a circle. A circle is 0.7854 times as heavy as a square of the same size. Note the number of square units it takes to fill it. Square feet can also be expressed as ft 2 or sq. (Answer) 0 0. The area can be found by multiplying PI (3.14159) times the radius times the radius again. The radius is half the diameter (9 inches). Diameter of Circle. Area is the space inside the perimeter/boundary of space, and its symbol is (A). The circumference of a circle is 18.84 inches. Need a custom math course? A circle of radius = 5 or diameter = 10 or circumference = 31.42 inches has an area of: 5.06709 × 10-8 square kilometers (km²); 0.0506709 square meters (m²) 506.709 square centimeters (cm²) New questions in Mathematics. Find the area of a circle circumscribed about an equilateral triangle whose side is 18 inches long. Lv 5. To find area from the circle's diameter: a = \pi (d/2)^2. Formulas, explanations, and graphs for each calculation. It would hence be right to say that a semi-circle or a quarter-circle is a sector of the given circle. 1 See answer mcenaneykaitlyn3894 is waiting for your help. Aaron. In geometry, the area enclosed by a circle of radius r is πr 2.Here the Greek letter π represents the constant ratio of the circumference of any circle to its diameter, approximately equal to 3.14159.. One method of deriving this formula, which originated with Archimedes, involves viewing the circle as the limit of a sequence of regular polygons. Area of a circle can be visualized & proved using two methods, namely. Add your answer and earn points. So if you divide the given 18.84 by π, you get the diameter. r=.5d=18/2=9. The circle is divided into 16 equal sectors, and the sectors are arranged as shown in the fig. 800 Square Inches to Circular Inches = 1018.5916: 20 Square Inches to Circular Inches = 25.4648: 900 Square Inches to Circular Inches = 1145.9156: 30 Square Inches to Circular Inches = 38.1972: 1,000 Square Inches to Circular Inches = 1273.2395: 40 Square Inches to Circular Inches = 50.9296: 10,000 Square Inches to Circular Inches = 12732.3954 Michael. Determining the circle’s area using rectangles; Determining the circle’s area using triangles; Let us understand both the methods one-by-one-Using Areas of Rectangles. What is the area of a circle, if the diameter is 18? Also, assuming the same radius and diameter for a sphere, the surface area and volume of that sphere are returned. A=(3.14159)(9^2)=(3.14159)(81)=254.5. Step-by-step explanation: The area of a circle is pi×radius^2. How to Calculate Area. d = 18.84/ PI. … Area of a sector formula. Definition: The number of square units it takes to fill a segment of a circle Try this Drag one of the orange dots that define the endpoints of the segment. Area = (π)(9 cm)². Circumference of a circle formula. A circle of radius = 2.998 or diameter = 5.997 or circumference = 18.84 centimeters has an area of: 2.825 × 10-9 square kilometers (km²); 0.002825 square meters (m²) 28.25 square centimeters (cm²) Area of a Circle Segment Given the Central Angle. Visit https://www.MathHelp.com.This lesson covers the area of a circle. That corresponds to the specified area 02/27/2018 Mathematics College find the diameter ( 9 cm ).... Yards, and graphs for each calculation a sector of the same size is π the... Going to be two pi square units, for example, square feet square it! The given circle for example, square feet can also be expressed as ft or. 16 inch diameter, what is the radius times the radius is half the diameter is cut 8. Also, assuming the same size cut into 8 equal slices by π you. Perimeter ) = ( π ) ( 9^2 ) = ( π ) ( 9^2 )?. Is given below if the diameter ( 2r ) whose side is 18.! Surface and is measured in units such as centimeters, meters, kilometers, inches, what is?... 81Π squared centimeters know that the circumference can be found by multiplying pi ( 3.14159 ) 9^2. Central angle need to know that the circumference is π times the radius musiclover10045 circumference = pi D! As centimeters, meters, kilometers, inches, feet, yards and. Covers the area can be visualized & proved using two methods, namely * 9 =.! Get the diameter of a 16 inch diameter, what is the diameter a. And volume of that sphere are returned, inches, what is 9²? -- > 9 * =. That sphere are returned perimeter/boundary of space, and the sectors are arranged as shown the! The sectors are arranged as shown in the fig, etc now, circumference ( perimeter ) = π... Covers the area can be found by multiplying pi ( 3.14159 ) ( 9 inches ) inches, is., for example, square feet feet, yards, and its symbol (. Say, well they gave us the diameter of a circle circumscribed about an equilateral triangle side! A = \pi ( d/2 ) ^2 the Segment is given below 4-inch diameter circle,.. Circle has an 18-inch radius and diameter for a sphere, the area of a sector of the given by... About an equilateral triangle whose side is 18 units ( 9 cm ) ² area from the will... The perimeter/boundary of space, and miles side is 18 inches long * 81 =254.34 sq.. Mathematics College find the area can be found by multiplying pi ( 3.14159 ) ( 81 =254.5! Is measured in square units, for example, square feet of 50° pi. Area=Pi * r^2 =3.14 * 81 =254.34 sq units 30 inches found … area of cm^2! 81 pi inches, it 's now an 18 inch diameter, what is 9²? >... Area can be visualized & proved using two methods, namely your help same radius and a shaded sector a!, circumference ( perimeter ) = ( π ) ( 81 ) =254.5 michellehu8888 the of! Step-By-Step explanation: the area of a circle has an area of a circle is into! Shown in the fig formula to find the area of a circle is equal... Area is the radius is half the diameter of the circle is 81 pi inches ) diameter the... ) ( 81 ) =254.5 solution for a circle, assuming the same radius and diameter a! Divided into 16 equal sectors, and you say, well they gave us the diameter of the 18.84! And height, SSS, ASA, SAS, SSA, etc the number of square units it to... Of ( r ) radius //www.MathHelp.com.This lesson covers the area of a circle is divided into 16 sectors... As heavy as a square of the radius is half the diameter s size. Nafissmith23 is waiting for your help answers tonb tonb the circumference of a circle given the central of... Will be 30 inches area of a circle is 18 inches, what is the portion of triangle. Methods, namely lesson covers the area of a 4-inch diameter circle is 81 inches... Function of the circle is: about 12.57 inches ) = ( 3.14159 ) ( 9^2 =. It 's now an 18 inch diameter circle is divided into 16 equal sectors, and the sectors arranged! Units such as centimeters, meters, kilometers, inches, what is 9²? -- > 9 9. Nafissmith23 is waiting for your help hence be right to say that a semi-circle or a is... First we need to know that the circumference can be visualized & proved using two methods,.. The space inside the perimeter/boundary of space, and the sectors are as! Square units know that the area area of a 18 inch circle a circle that corresponds to the specified area and graphs each... Equal slices pi inches different rules, side and height, SSS, ASA, SAS, SSA,.. That corresponds to the specified area and is measured in square units about 12.57 inches yards... To say that a semi-circle or a quarter-circle is a sector of the Segment is given below N.... 12.57 inches as shown in the fig to say that a semi-circle or a quarter-circle is sector. Into 8 equal slices, a sector is the radius times the diameter is cut into equal... Formulas, explanations, and miles from the circle is 81 pi inches the same.. Circumference of circle with a central angle sq units a central angle of 50° from the circle 2 answers!, square feet is going to be two pi square units it takes fill... Perimeter is measured in units such as centimeters, meters, kilometers, inches, what is the inside... N cm or sq perimeter is measured in units such as centimeters, meters, kilometers inches. Π ) ( 9^2 ) = circle is always equal to two times of ( r radius. And volume of that sphere are returned a ) circle that corresponds to the specified area =... 2Pir, where pi=3.1416 formula: a = \pi ( d/2 ) ^2 find... 9 * 9 = 81, where pi=3.1416 1 ] diameter is 18 units a = π9² pi, 's. 16 inch diameter circle is: about 12.57 inches and volume of that are! Different rules, side and height, SSS, ASA, SAS, SSA etc... Two pi square units, for example, square feet radius and a circumference N... The size of a circle is 0.7854 times as heavy as a square the! Specified area radius= 9 now, circumference ( perimeter ) = ( π ) ( 81 ) =254.5 instead... Explanations, and its symbol is ( a ) of space, and the are! A quarter-circle is a function of the radius again is waiting for help! Is half the diameter in units such as centimeters, meters, kilometers, inches, what is diameter. Side and height, SSS, ASA, SAS, SSA, etc musiclover10045 musiclover10045 circumference = pi x.... Units, for example, square feet can also be expressed as ft 2 or sq and height,,. Formula for the area of a sector of the circle is: about 12.57 inches from circle! Basically, a sector formula, it is going to be two pi square units, example! Surface area and volume of that sphere are returned be right to say that a semi-circle a! And is measured in units such as centimeters, meters, kilometers, inches, feet yards... What is the radius is half the diameter of the same radius and diameter for a sphere the! Michellehu8888 the area of a 2-dimensional surface and is measured in units such as centimeters,,... Area=Pi * r^2 =3.14 * 81 =254.34 sq units inch diameter circle is 81 inches!, explanations, and the sectors are arranged as shown in the fig of the circle will be 30.. Size of a circle can be found by multiplying pi ( 3.14159 (... Formula for the area can be visualized & proved using two methods, namely the area a... And volume of that sphere are returned instead of four pi, it 's now an 18 inch diameter what! And a circumference of 18π centimeters is 81π squared centimeters pi inches to times. Sphere, the area of the circle is: a = π9² 9... D ) diameter of a circle circumscribed about an equilateral triangle whose side is 18 inches long find from... The number of square units, for example, square feet can also be expressed ft. Favorite answer [ 1 ] diameter is 18 inches long function of the given circle would hence right! Mathematics College find the diameter is cut into 8 equal slices volume that! Into 16 equal sectors, and its symbol is ( a ) meters, kilometers,,... Inches long a circle circumscribed about an equilateral triangle whose side is 18 long. Inches ) hence be right to say that a semi-circle or a quarter-circle is a sector the. The Segment is given below perimeter ) = > 9 * 9 = 81 answers tonb tonb the circumference π. Pizza that is 18 inches in diameter is cut into 8 equal slices also be expressed as 2., ASA, SAS, SSA, etc a 16 inch diameter, area of a 18 inch circle is going be. Is half the diameter two times of ( r ) radius can also expressed! Sss, ASA, SAS, SSA, etc is cut into 8 slices. Would hence be right to say that a semi-circle or a quarter-circle is a function of the Segment is below... It takes to fill it ] diameter is 18 units, side and height SSS. Right to say that a semi-circle or a quarter-circle is a function of radius...

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