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Question

The percentage of world population of countries is given in the following table. Find the value of a. If a pie diagram has to be drawn, what would be the measure of the central angle from USA?
Country India China Russia USA Others Total
% of population 15 20 a a 25 100

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Solution

The % population of USA = total % population - rest. => 15+20+a+a+25=100; 60+2a=100; a=20; For central angle of USA= (20/100)*360 = 72 degrees

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