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WAEC Mathematics 2020 Question 18

Question 18

Mensuration of Solids

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

  1. A.280 cm2
  2. B.166 cm2
  3. C.140 cm2
  4. D.83 cm2
Show the answer and explanation

Answer: B (166 cm2)

Explanation

Total surface area = 2(lb + bh + lh) = 2(35 + 20 + 28) = 166 cm2.