How to find the sides of a rectangle if the perimeter 20 is known?

univerkov | June 21, 2021 | education

Let a and b be the sides of the rectangle.

2a + 2b = 20;

a + b = 10;

a = 10 – b;

b = 10 – a.

Explanation: The perimeter is the sum of the lengths of all sides. The parallel sides are equal in pairs. We write the formula for the perimeter of the rectangle through the letters and express what each side is equal to.

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