Perimeter is the sum of the lengths of all the sides of a figure. Thus perimeter is a measure of lengths. In case of a circle the perimeter means its circumference.

The two dimensional space enclosed by the perimeter is called area. Since it is a two-dimensional space, area is measured in square units like cm² or square feet.

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Index

4.1 Perimeter
4.2 Square
4.3 Rectangle
4.4 Parallelogram
4.5 Triangle
4.6 Trapezoids
4.7 Circles

Chapter 5