Question

HELP PLS!! What is the diameter of a circle whose circumference is 16pi centimeters?

32 cm
16 cm
4 cm
8 cm

Answer 1

It should be 8 cm because 8 is half of 16 and diameter should be half of radius

Answer 2

answer: 8

Explanation:

Use the formula for the area of a circle:

A = π r 2

Here, the area is  16 π

16 π = π r 2  

Divide both sides by  

16 = r 2

Take the square root of both sides:

√ 16 = √ r 2

4 = r

Since the radius of the circle is  

4

, the diameter is twice that:

d = 4 × 2 = 8