The radius of a 21 inch circle is 10.5 inches, because radius is half of a diameter in a circle. 21-inch (533 mm) diameter circular area and an ambulance gurney or stretcher minimum size 24 inches by 84 inches (610 mm by 2134 mm) with not less than 5-inch. Within a hundredth of an inch seems close enough to me. What is the radius of a circle with a 21 inch diameter? In a circle, can you find the radius and area if the circumference is 4. Using the formula A = 1/4πd 2 where d is the diameter, we haveĪrea = 1/4πd 2 = 1/4 x 3.14 x 21 2 = 346.36 The area of a 21 inch circle is 346.36 square inches. What is the area of a 21 inch diameter circle? We can also use the A = 1/4πd 2 formula where d is the diameter. To calculate what is the area of a 21 inch diameter circle, use the formla of A = πr 2, where r is the radius. Online Calculators > Math Calculators > Area of 21 Inch Circle Area of 21 Inch CircleĪrea of 21 inch circle calculator is used to calculate the area of a circle with diamater of 21 inches.
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