In a pie chart with three sectors $A:B:C = 2:3:4$, the central angle of sector $B$ is:

In a pie chart with three sectors $A:B:C = 2:3:4$, the central angle of sector $B$ is:
  1. $90^\circ$
  2. $108^\circ$
  3. $120^\circ$
  4. $144^\circ$

Solution

Total parts $=2+3+4=9$. Angle of $B = (3/9)\times 360^\circ = 120^\circ$.

Asked in: IMO

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