Perimeter - Definition with Examples
What is Perimeter?
Perimeter Definition: The perimeter is the total length of the sides or edges surrounding a shape.
Perimeter = Sum of the lengths of all sides |
Real Life Examples
A few practical applications of the perimeter in geometry include finding the length of the fence that covers a garden or finding the boundary of a soccer field or the length of a ribbon required to cover the borders of a table mat.
How to find the perimeter of a polygon?
Regular Polygon
The length of all sides of a regular polygon is equal. The perimeter of a regular polygon is determined by multiplying the number of sides by the length of any side.
Perimeter of a Regular Polygon = Number of sides X Length of a side |
Non-Regular Polygon
The perimeter of non-regular shapes can also be calculated by adding the lengths of all the sides.
Perimeter of Non-Regular Polygon = Sum of the lengths of all sides |
The table below shows the perimeters of some common shapes.
TriangleP = a + b + c |
SquareP = 4 x a |
RectangleP = 2 ( a + b ) |
Regular PentagonP = 5 x a |
Regular HexagonP = 6 x a |
Regular OctagonP = 8 x a |
The Complete K-5 Math Learning Program Built for Your Child