The perimeter of the rectangle is equal to the sum of all sides, while the sides are pairwise equal to each other. Therefore, the formula for the perimeter of a rectangle is
P = 2 (a + b).
Example 1. The sides of a rectangle are 10 and 8 cm. Find its perimeter.
Solution. Substituting the values into the rectangle perimeter formula
P = 2 * (10 + 8) = 36 (cm) or 3600 (mm.).
Answer. The perimeter is 36 cm. 3600 (mm.).
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