Q3 of 14 Page 303

Prameela painted the outer surface of a cabinet of measures 1m × 2m × 1.5m. Find the surface area she cover if she painted all except the bottom of the cabinet?

Measurement of the cuboid

Length(L) = 1 m breadth(B) = 2 m and height(H) = 1.5 m


Total surface area = 2(LB + BH + LH)


= 2(1 × 2 + 2 × 1.5 + 1 × 1.5)


= 2(2 + 3 + 1.5)


= 2(6.5)


= 13 cm2


Area of bottom surface = 1 × 2 = 2m2


Hence, area covered by painting = 13 – 2 = 11 m2


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