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Q: What is the area of a circle that has a radius of 18cm?

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Using 3.14 as Pi the area of circle is: 1017.36

9 cm (r = d/2)

The general equation for the area of a circle is π*r2, where r is the radius of the circle, and π is pi, which is approximately 3.14159. The diameter of a circle is how far it is from one side of the circle to the other, and the radius is how far it is the from edge to the center, thus the radius is half the diameter. Therefore the area is π*(92) ~ 254.47

A = 254.47 cm2

The perimeter is pi*r + 2r = 92.6 cm

The diameter is always double the radius so in this case, it is 18cm

The area of a circle if the radius is 9m 254.5m2

The area of a circle with a radius of 14.4 is 651.4

The area of a circle of radius 21 is 1386

The radius of a circle with the area of 36 is 3.385

Area of a circle = pi*radius squared

SA = 904.78 cm2

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