how do we find the area of a circle?

The area of a circle is the number of square units inside that circle. 

where a is the area and r is the radius of the circle.

Example 1:	The radius of a circle is 3 inches.
Solution:
	= 3.14 · (3 in) · (3 in)
	= 3.14 · (9 in2)
	= 28.26 in2