The area of a rectangle is 120 cm². If its length is 15 cm, find its perimeter.
A46 cmCORRECT
B38 cm
C30 cm
D23 cm
GCEMathematicsMensuration2022
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Why the answer is A, and why the others tempt you.
Width = 120 ÷ 15 = 8 cm. Perimeter = 2(length + width) = 2(15 + 8) = 2 × 23 = 46 cm. Option B is a common error from adding only one pair of sides without doubling, and option D results from forgetting to multiply by 2.
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