First of all, let’s determine the width of the rectangle, provided that it is 3 times less than its length, equal to 27 cm:
27: 3 = 9 cm.
The perimeter is the sum of all sides, for such a figure whose opposite dimensions are equal, it is calculated by the formula:
P = 2a + 2b = 2 * 27 + 2 * 9 = 54 + 18 = 72 cm.
Let’s find the area by the formula:
S = a * b = 27 * 9 = 243 cm².
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