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 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
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