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WAEC Mathematics 2020 Paper

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Question : 17

Total: 48

A solid cuboid has a length of 7 cm, a width of 5 cm, and a height of 4 cm. Calculate its total surface area.

280 cm $^2$
166 cm $^2$
140 cm $^2$
83 cm $^2$

Solution:

Total = 2(LB + BH + LH)

Surface area

= 2(7 x 5 + 5 x 4 + 7 x 4)

= 2(35 + 20 + 28)

= 2(83)

= 166cm $^2$

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