Find the sum of the sides (length and width) of the rectangle.
To do this, divide its perimeter by 2, since the opposite sides of the rectangle are equal to each other.
56/2 = 28 cm.
Let’s find the second side.
To do this, subtract the known side from the sum of the length and width.
28 – 7 = 21 cm.
Find the area of the rectangle.
To do this, we multiply its length by width.
21 * 7 = 147 cm2
Answer: The length of the second side is 21 cm, the area of the rectangle is 147 cm2
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