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WAEC Mathematics 1999 Question 33

Question 33

Mensuration of Solids

The height of a pyramid on a square base is 15cm. If the volume is 80cm3, find the length of the side of the base

  1. A.3.3cm
  2. B.5.3cm
  3. C.4.0cm
  4. D.8.0cm.
Show the answer and explanation

Answer: C (4.0cm)

Explanation

V = ⅓ × s2 × 15 = 5s2 = 80, so s2 = 16 and s = 4 cm.