Perimeter

Perimeter is a math concept that measures the total length around the outside of a shape. To find the perimeter, you add together the lengths of all the sides.

The perimeter of a shape is the total length of its boundary or edge. It is calculated by adding up the lengths of all its sides. For example, the perimeter of a square is the sum of the lengths of its four sides, while the perimeter of a triangle is the sum of the lengths of its three sides.