If the diameters of a circle is increased by 100% . Its area is increased by ? A. 100% B. 200% C. 300% D. 400% Answer Workspace Report Discuss Answer with explanation Answer: Option C Explanation Area of circle = πd2/4 diameters increased by 100%, then new area = π(2d)2 /4 => πd2 Then, New area = (πd2 – πd2/4) => 3πd2/4 increase percent =[(3πd2/4) / ( πd2/4) ]*100 % = [(3πd2/4) x (4/πd2)]*100 % = 300% Workspace
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