The perimeter of the rectangle is 56 cm, and one of its sides is 7 cm. Find the area of the rectangle.
| May 13, 2021 | education
The perimeter of the rectangle is found by the formula:
P = 2 (a + b)
P = 56 cm
a = 7 cm
From the formula we find the side b:
b = P / 2 – a
b = 56/2 – 7 = 28 – 7 = 21 cm
Now we find the area of the rectangle. To do this, you need to multiply the length by the width.
S = a * b
S = 7 * 21 = 147 cm ^ 2
Answer: 147 cm ^ 2
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