A solid cuboid has a length of 7 cm, a width of 5 cm, and
MATHEMATICS
WAEC 2020
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.
- A. 280 cm2
- B. 166 cm2
- C. 140 cm2
- D. 83 cm2
Correct Answer: B. 166 cm2
Explanation
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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