Question

Gavin measured a round jar lid. Then he calculated that the area of the lid is 50.24 square centimeters. What is the lid's diameter?
Use 3.14 for ​pi.

Answer 1

First divide the area by pi
50.24/3.14 = 16
Then take the square root of the result
$\sqrt{16}$ = 4  <-- This is the radius
Finally double the radius to get the diameter.
4 x 2 = 8
The diameter of the circle is 8 sq cm