What is the area of this circle? (express your answer using π.)
(note: the diameter is 10ft.)

Area of a circle is:

A = pi * r^2

If the diameter is 10 feet, the radius will be half of that or 5.

So:

A = 3.14 * 5^2

Simplify exponent:

A = 3.14 * 25

Multiply:

A = 78.5

The area is πr².
The radius r is half the diameter. The diameter is 10 ft so the radius is 5 ft.



The area is 25π ft².

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