Q: What is the area of the circle if the diameter is 40 inches inches?

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Area = pi * r2r = d/2 = 40/2 = 20Area = 400*pi= 1,256.636 approximate

Area of a circle = πr² (remember that r or radius is exactly half of the diameter) Radius therefore = 40/2 = 20 inches Thus the Area = 3.14159 × 20 squared = 1256.636 square inches

40'

Area of circle: pi*20^2 = 400*pi square units

400 x pi squinches

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Area of circle =(11/14) * d *d d denotes diameter. For your case answer is 7.1365 inches

The circumference of a circle, if the diameter is 40 inches, is about 125.7 inches. (C = d x Pi).

Area = pi * r2r = d/2 = 40/2 = 20Area = 400*pi= 1,256.636 approximate

Area of a circle = πr² (remember that r or radius is exactly half of the diameter) Radius therefore = 40/2 = 20 inches Thus the Area = 3.14159 × 20 squared = 1256.636 square inches

If the diameter of a circle is 40 m then the area (in terms of Pi) is: about 400pi m2

A ≈ 1,256.64

40'

Using 3.14 as Pi the area of circle is: 1256.0

A=Ï€rÂ², and r=d/2, so r=40 inches and A = 1600Ï€ sq in = 5026.55 sq in

In order to find the diameter of a circle if you have the area is to rearrange the formula for the area of a circle to put diameter as the unknown, like so: PIE*d = Area of a Circle d = (Area of a Circle) / PIE Therefore if the area of your circle is 40cm, 40/PIE = 12.73cm and that's the diameter.

Area of circle: pi*20^2 = 400*pi square units

1256 inches ++ Another Answer ++ The formula for finding the Circumference of a circle is C = Pi x D where D is Diameter and Pi is 3.1416. The Radius of a circle is one-half of the Diameter, hence the Diameter of a circle with a 20-inch Radius is 40 inches. Using the formula above, multiply 40 x 3.1416 to find the Circumference: 40 x 3.1416 = 125.664 inches.