Question

The circumference of a circular platter is 50 inches. If the radius is

doubled, what is the circumference of the new platter?

Answer 1

100 inches

Explanation:

the circumference (C) of a circle is calculated as

C = 2πr ( r is the radius )

if r is doubled , that is r = 2r , then

C = 2π × 2r = 4πr ← double the original circumference

then circumference of new platter = 2 × 50 = 100 inches