Perimeter

The perimeter of a 2D shape is the total length of all its sides.

For example, a rectangle has four edges, so its perimeter is the total of those four edges added together.

Some more examples about how to calculate the perimeter of some shapes:

 

P = 9+8+5 = 22 cm

P = 3+3+3+3 = 12 cm or P = 4 x 3 =12

P = 6+6+4+3+3 = 22 cm