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MTH 232 Section 10.2 Area and Perimeter Area • The number of square units required to cover a region. • Area is measured in square units (ft2, cm2, in2) Perimeter • The distance around a region (found by adding up the lengths of the sides of the polygon). • Perimeter is measured in regular (nonsquared) units. Circles • Because circles don’t have sides, the geometric equivalent of perimeter is circumference: More About Circles • Circles, however, do have area. The definition of area for a circle is the same as the definition of area for a polygon, despite the fact that it is hard to visualize filling a circle with “square units” About Pi • Pi is a greek letter that is used to represent the ratio of the circumference of a circle to its diameter: Composite Areas