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The area of a circle is given by the formula A = πr2 where pi is the ratio of the circumference of a circle to its diameter and r is the radius. π = 3.1416 approx.

A = π182 = 324π = 1017.88 in2 (2dp)

Q: If the radius of a circle is 18 inches what is the area?

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A circle with a radius of 18 inches has an area of 1,017.88 square inches.

The area is 1,020 square inches.

The radius is 9 inches because area of circle is pi*9 squared = 81pi square inches and the diameter is twice the radius which is 2*9 = 18 inches

Radius of circle: 18/2pi = 2.865 inches rounded to 3 decimal places

radius = 18/(2*pi) 2.864788976 area = pi*2.8647889762 = 25.783 square inches to 3 dp

Related questions

A circle with a radius of 18 inches has an area of 1,017.88 square inches.

The area is 1,020 square inches.

The radius is 9 inches because area of circle is pi*9 squared = 81pi square inches and the diameter is twice the radius which is 2*9 = 18 inches

If the diameter of a circle is 18 inches then its radius is 18/2 = 9 inches

First we have to find the radius: 2*pi*radius = 18*pi Divide both sides by 2*pi to find the radius: radius = 9 inches Area of a circle = pi*radius2 Area = pi*92 = 81pi or 254.4690049 square inches

Radius of circle: 18/2pi = 2.865 inches rounded to 3 decimal places

radius = 18/(2*pi) 2.864788976 area = pi*2.8647889762 = 25.783 square inches to 3 dp

A circle with a radius of 18 centimeters has an area of 1,017.88 square centimeters.

A circle with a radius of 9 inches has a circumference of 56.55 inches and a diameter of 18 inches.

18 inches

A circle with a radius of 18 inches has a circumference of 113.097 inches.

Radius is 18/2pi = 2.865 inches rounded to 3 decimal places