Question

A circle has an area of 16 mm². Find its circumference.​

Answer 1

14.2 mm

Explanation:

Area = pi r^2 <=======use this to find r,

then d= 2r and circumference = pi * d

16 = pi r^2

so r = sqrt (16/pi)

then diameter = 2r = 2 sqrt (16/pi)

circumference = pi * d = pi * 2 sqrt (16/pi) = 14.2 mm