Hi,
See your solution here http://teachoo.com/4439/713/Example-1---Find-rate-of-change-of-area-of-circle-per-second/category/Examples/
To see solutions of all NCERT questions, please visit http://teachoo.com/maths/
Written on Jan. 8, 2017, 5:26 p.m.
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Answer of this question
Find the rate of change of the area of a circle per second with respect to its radius r when r=5cm
Davneet Singh
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