Question

A nail has a circular head with a diameter of 0.40 centimeters.
What is the area of the nail's head, rounded to the nearest hundredth of a square centimeter?

Answer 1

π r^2 is the formula for area of a circle. So take half the diameter, which is 0.20, and plug that in for r. Your answer will be 0.4π or ≈1.2566