First you need to find the sum of the two sides of the rectangle.
This requires dividing the perimeter value by 2.
7.8 / 2 = 3.9 cm.
Let’s write one of the sides of the rectangle equal to x.
Since the second side is 1.3 cm longer than the first, then its length will be: x + 1.3 cm.
We get the equation for the sum of the sides.
x + x + 1.3 = 3.9.
2 * x = 3.9 – 1.3.
2 * x = 2.6.
x = 2.6 / 2 = 1.3 cm (first side).
x + 1.3 = 1.3 + 1.3 = 2.6 cm (second side).
Answer: The sides of the rectangle are 1.3 and 2.6 cm.
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