Question

A circular picture is 8 inches in diameter what is the area of the picture in square inches

Answer 1

area = PI x r^2

radius = 1/2 diameter

1/2 of 8 = 4

3.14 x 4^2 = 3.14 x 16 = 50.24 square inches ( answer may vary depending on what you use for PI. 3.14 is common)

Answer 2

The formula for the area of a circle is:
A=3.14r^2
To find the radius you divide the diameter by 2 so:
8/2=4
Then plug in 4 for the radius and solve.
A=3.14x4^2
A=3.14x16
A= 50.24
So the answer is 50.24 square inches