The perimeter of the rectangle is 20cm. Its width is 3cm. What is the length of this rectangle?
August 31, 2021 | education|
The perimeter of a rectangle is the sum of the length and width times two.
The first way.
1. Determine what the length of the rectangle is equal to.
(20 – 3 * 2) / 2 = (20 – 6) / 2 = 14/2 = 7 centimeters.
Answer: The length of the rectangle is 7 centimeters.
We will solve the problem using an equation with one unknown.
1. The length of the rectangle is x centimeters.
2. Let’s compose and solve the equation.
(x + 3) * 2 = 20;
2x + 6 = 20;
2x = 20 – 6 = 14;
x = 14/2 = 7;
x = 7;
Answer: The length of the rectangle is x = 7 centimeters.
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