How do we find the area of a circle?

*We find the area of a circle by the formula A is the area and R  is the radius of the circle.
In other words . r<sup>2




for example</sup> 
  lets say that r= 8cm 

-in that case since we trying to find the area of the circle we going to use the formula of  a circle which is . r^{2
-we going to substitute r for 8 
-which our formula now is} . 8^{2
-now it equals 64}.