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To find the length of side A, look To find the length of side B, look
at the two rectangles that makes at the two rectangles that makes
up the figure. up the figure.
Opposite sides of rectangles are Opposite sides of rectangles are
of the same length. of the same length.
5 cm = A + 3 cm 8 cm = B + 4 cm
A = 2 cm B = 4 cm

Example: Perimeter

Find the perimeter of the figure. Each unit is 1 cm. Label your answers in "cm".

Perimeter = 18 cm
Perimeter
Add up the length of all the sides to get the perimeter.
Starting from point (1,6) and going clockwise, we get
Perimeter = 1 cm + 3 cm + 3 cm + 2 cm + 4 cm + 5 cm
= 18 cm