What is the area of a circle with a diameter of 4

The area of a circle is pi * radius^2.

Diameter / 2 = radius.

4 / 2 = 2

The radius is 2. Plug this value into the area formula.

A = pi (2) ^2

Area = 12.57

Answer: Area = 12.57.

Step-by-step explanation:

The area of a circle is pi * radius^2.

the diameter / 2 = radius.

4/2=2 (2 is radius)

The radius should be 2. You put that into the area formula which is A=pi (2) ^2.

The area should be 12.57 and that is the final answer.