If the diameter of a circle is 12mm, what is the area?

Question

If the diameter of a circle is 12mm, what is the area?

Answer 1

Pi is only used to find the circumference.

To find the diameter, use this formula:

D= 2r

Answer 2

diameter = 2 times the radius, so the radius is equal to 6mm. the formula for area of a circle is pi times the radius squared. so pi times 6mm squared is equal to 36mm squared times pi or approximately 113 mm squared

Answer 3

Use the formula A=(pi)r^2

since the diameter is 12, the radius will be 6.

So you do A=(pi)(6^2)

=36(pi)

=113.0973355

Answer 4

area of circle = radius x radius x pi(3.14)

radius = 1/2 diameter

diameter = 12mm

radius = 12mm x .5 = 6mm

area = 6mm x 6mm x 3.14

6 x 6 x 3.14 = 113.04mm