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CBSE Class 10 Answered

What will be the increase in the area of a circle if the radius is increased by 140%?
Asked by | 07 Feb, 2012, 11:59: AM
answered-by-expert Expert Answer
Old radius = r
Old area = pie * r * r
Ner radius = r + 1.4r = 2.4r
New area = pie * (2.4r) * (2.4r)
Percentage increase is = (New area - Old area)/Old area * 100
= 476%
Answered by | 07 Feb, 2012, 02:28: PM
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