In the diagram, the shaded part is carpet laid in a room with dimensions 3.5m...

WAEC 2015

In the diagram, the shaded part is carpet laid in a room with dimensions 3.5m by 2.2m leaving a margin of 0.5m round it. Find area of the margin

A. 4.7m²
B. 4.9m²
C. 5.7m²
D. 5.9m²

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Correct Answer: Option A

Explanation

Area of floor = 3.5m x 2.2m = 7.7m²

Area of carpet = (3.5 - 0.5 - 0.5)m x (2.2 - 0.5 - 0.5)m

2.5m x 1.2m = 3m²

hence, area of margine

= area of floor - area of carpet

= (7.7 - 3)m²

= 4.7m²

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In the diagram, the shaded part is carpet laid in a room with dimensions 3.5m...

Correct Answer: Option A

Explanation

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