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JAMB 1993 · UME · Q42

Quantities in the proportions 1, 4, 6, 7 are to be represented in a pie chart. Calculate the angle of the sector with proportion 7.

Worked solution (try it first)
  1. Add the proportions: 1+4+6+7=181 + 4 + 6 + 7 = 18 parts.
  2. Each part is worth 360∘18=20∘\frac{360^\circ}{18} = 20^\circ.
  3. So proportion 7 has 7×20∘=140∘7 \times 20^\circ = 140^\circ, option D.

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