Perimeter of a Polygon

A polygon is a 2-dimensional figure formed by straight sides. The polygon with least number of sides is the triangle. Squares, rectangles, parallelograms, trapezoids are four sided polygons. A polygon with five sides is called a pentagon and a polygon of eight sides is called an octagon and so on.

A polygon with all sides equal and all angles equal is a regular polygon, otherwise it is an irregular polygon.

The perimeter of the polygon is the sum total of the lengths of its sides.

If the length of side of a regular polygon of n sides is l, then its perimeter is given by nl

Problem 1

Find the perimeter of the given polygon.

Solution

The perimeter of any shape is the sum of the lengths of its sides.

So perimeter of given polygon =

8 cm + 8 cm + 10 cm + 10 cm + 7 cm = 43 cm