# The sides of the rectangle are 15 cm and y cm. Write down the expression for calculating

March 27, 2021 | education

| **The sides of the rectangle are 15 cm and y cm. Write down the expression for calculating the perimeter of the rectangle. Find the perimeter if y is 10, 1.**

To solve this problem, remember that the perimeter of a rectangle is the sum of the lengths of all its sides. Since in a rectangle the opposite sides are equal, then P = 2 * (a + b), where a is the length, b is the width. We calculate what the perimeter is equal to if the sides are 15 centimeters and centimeters.

P = 2 * (15 + y) = 30 + 2y.

If y = 10, then 30 + 2 * 10 = 30 + 20 = 50 centimeters.

If y = 1, then 30 + 2 * 1 = 30 + 2 = 32 centimeters.

Answer: 50 cm, 32 cm.

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