What is the area of 9 inch diameter circle?

Answer 1

Area= pi × radius2

Area= 3.14 × (4.5 in2)

Area= 3.14 × 20.25

Area= 63.585 in2

The answer is 63.585. You would find this answer by doing this:

20.25

x3.14

_______

8100

20250

+607500

_______

635850

Then you would take the zero off the end.

Answer 2

The area of a circle is calculated using the formula A = πr^2, where r is the radius of the circle. Since the diameter is twice the length of the radius, the radius of a 9-inch diameter circle would be 4.5 inches. Plugging this into the formula, the area of the circle would be A = π(4.5)^2 = 63.585 square inches.

Answer 3

81