three circles of radius 5cm each is cut from a circular sheet of paper with 15 cm . what is the ratio of uncut to the cut portion
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Step-by-step explanation:
Area of sheet of paper with radius 20 cm. =π(20)
2
=400π cm
2
Area of 4 circles of radius 5 cm. =4×π(5)
2
=100π cm
2
Area of remaining portion =400π−100π=300π cm
2
Therefore, required ration =300π:100π=3:1
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