about area of a circle

Asked by ishmeet kaur Sidana | 8th Jan, 2014, 09:06: PM

Expert Answer:

Let 'r' be the radius of the circle and its area =
When the radius is decreased by 'N', the new radius of the circle = (r - N).
 
Therefore the area of the new circle = .
But it is given as half of the old area.
 
That is,

Answered by Vimala Ramamurthy | 9th Jan, 2014, 09:43: AM

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