### Home > MC2 > Chapter 10 > Lesson 10.2.4 > Problem 10-119

10-119.

*A* = *r*^{2}π*C* = 2π*r*

Substitute 4 for *r* in each equation.

*A* = 16π = 50.27 cm^{2}

What is the circumference?

10-119.

*A* = *r*^{2}π*C* = 2π*r*

Substitute 4 for *r* in each equation.

*A* = 16π = 50.27 cm^{2}

What is the circumference?