area of a circle

$Area = \pi {r}^{2}$

So you do:

$25\pi = 78.539816339744831{cm}^{2}$

Area of a circle is    pi x r^2

3.14  x  (5^2)  =  3.14 X 25 = 78.5  SQUARE CENTIMETERS   also written as  78.5 cm^2