Question

The area of a circle is 28.26 square centimeters. What is its diameter (use 3.14 for ð)?

Answer 1

$The\ area\ of\ the\ circle:A_O=\pi r^2\\\\A_O=28.26\ cm^2;\ \pi\approx4.14\\\\subtitute\\\\3.14r^2=28.26\ \ \ |divide\ both\ sides\ by\ 3.14\\\\r^2=9\\\\r=\sqrt9\\\\r=3\ (cm)\\\\d-a\ diameter\\\\d=2r\\\\\boxed{d=2\cdot3cm=6cm}$

Answer 2

Area of circle= pi*r^2
 28.26=pi*r^2
28.26/3.14=r^2
sqrt9=r
3=r
r=3
d=2r
2(3)
=6