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JAMB 2003 · UME · Q33

A trapezium has two parallel sides of length 5 cm and 9 cm. If the area is 21 cm221\text{ cm}^2, find the distance between the parallel sides.

Worked solution (try it first)
  1. Area of a trapezium =12(a+b)h= \frac12(a + b)h: 12(5+9)h=21\frac12(5 + 9)h = 21.
  2. So 7h=217h = 21 and h=3h = 3 cm, option B.

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