Question

A circular tabletop has a circumference of 94.2 inches. What is its diameter? 15 in.

295.79 in.
30 in.
60 in

Answer 1

the circumference = 2 pi radius
94.2 = 2 × 3.14 × radius
94.2 = 6.28 × radius
94.2÷6.28 = radius
15 = radius
radius = 1/2 diameter
diameter = 2 × radius
diameter = 2 × 15
diameter = 30 in.

Answer 2

Circumference is pi*diameter, so 94.2/ pi = 30, so the answer is C. 30 in