1. From a circular sheet of paper with a radius 20 cm, four circles of radius 5 cm each are cut out. What is the ratio of the uncut to the cut portion?
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By: anil on 05 May 2019 02.33 am
Area of the large sheet =$$pi {20}^2$$ Area of the 4 circle of sheet = $$4pi {5}^2$$ Required ratio =[$$pi {20}^2 - 4pi {5}^2$$]:[$$4pi {5}^2$$] = 4-1 = 3:1
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