### Home > MC2 > Chapter 9 > Lesson 9.3.3 > Problem 9-112

9-112.

Area: π • *r*^{2}

Circumference: π · 2*r*

Find the radius based on the given diameter and substitute in for *r* to solve for the area and circumference.

*A* = π (7.2)^{2} ≈ 162.86 in^{2}

What would the circumference be?