If a circle's area is 16π, what is the length, in centimeters, of its diameter?

A.) 2

B.) 4

C.) 8

D.) 16

E.) 32

A.) 2

B.) 4

C.) 8

D.) 16

E.) 32

**Area of a circle is πr²**

16π = πr² {given}

16 = r² {divided each side by π}

r = 4 {took the square root of each side}

**A diameter is two times the radius.**

d = 2r

d = 2(4) {substituted 4 in for radius}

d = 8 {multiplied}

**C.) 8**

*- Algebra House*