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If the circumference of a circle increases from 4 Ďto 8n, then what about its area? [Delhi 2013] |
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Answer» Old circumference=4Π=4Π 2Πr=4Π2Πr=4Π r=4Π2Π=cmr=4Π2Π=cm Old area=Π(2)2=Π(2)2 =4Πcm2=4Πcm2 New circumference=8Π=8Π 2ΠR=8Π2ΠR=8Π R=8Π2Π=4cmR=8Π2Π=4cm New area=16Πcm2=16Πcm2 (∵∵area is quadruples) |
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