What will be the increase in the area of a circle if the radius is increased by 140%?

Asked by  | 7th Feb, 2012, 11:59: AM

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  | 7th Feb, 2012, 02:28: PM

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