This rectangle has a height of 13 units and a width of 14 units. Since there are four sides to a rectangle you have to add the length of each side to obtain the perimeter.
Perimeter is the distance around a shape. Consider this rectangle:
This rectangle has a height of 13 units and a width of 14 units. Since there
are four sides to a rectangle you have to add the length of each side to
obtain the perimeter.
PERIMETER = 13 + 13 + 14 + 14 = 54 units