The length of one side of the rectangle is 21 cm and the other is 12 cm less. Find the perimeter of the rectangle.

univerkov | June 16, 2021 | education

Since the opposite sides of a rectangle are equal, the formula for calculating its perimeter corresponds to:

P = 2a + 2b.

Let’s find this value for such a figure, the length of which is 21 cm, and the width is 12 cm less, by composing the expression:

P = 2 * 21 + 2 * (21 – 12) = 42 + 2 * 9 = 42 + 18 = 60 cm.

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