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

Area for circle is πr² so πr² = 28.26 and we can sub 3.14 as pi

3.14*r²=28.26 we can divide by 3.14 to get r² on it's own

r²=28.26/3.14

then we root both sides to get r on it's own

28.26/3.14=9 √9=3

and the diameter is double the radius 3*2=6 so the diameter is 6