Question

The diameter of a circle is 4 in. find its area in terms of pi

Answer 1

A = 4π in²

Explanation:

The area (A) of a circle is calculated as

A = πr² ( r is the radius )

Here d = 4, then r = 4 ÷ 2 = 2

A = π × 2² = 4π in²

Answer 2

Explanation:

A ≈12.57in²

d = Diameter

Using the formulas

A=πr2

d=2r

Solving forA

A=1/4πd²=1/4·π·4²≈12.56637in²