Question
A rectangular hall is 12 m long and 9 m wide. A carpet
is laid leaving a uniform border of 1 m all around the inside. Find the area of the border.Solution
Outer area = 12 × 9 = 108 m² Inner length = 12 − 2×1 = 10 m Inner width = 9 − 2×1 = 7 m Inner area = 10 × 7 = 70 m² Area of border = 108 − 70 = 38 m² Answer: 38 m²
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