Definition
The perimeter is the total distance around the outside of a shape. You find it by adding up the lengths of all the sides.
Imagine walking around the edge of a garden. The total distance you walk is the perimeter. It is like measuring the fence needed to go all the way around.
Examples
- A rectangle with sides 5 and 3 has a perimeter of 5 + 3 + 5 + 3 = 16.
- A square with side 4 has a perimeter of 4 x 4 = 16.
- A triangle with sides 3, 4, and 5 has a perimeter of 12.