Question

The radius of a circle is doubled. Find the ratio of area of new circle to given circle

Answer 1

TO FIND:-

AR. OF GIVEN CIRCLE : AR.OF NEW CIRCLE

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Let the radius of given circle be r.

Hence the radius of new circle is 2r.

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Ar. of given circle ==> 2πr

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Ar. of new circle ==> 2π*2r

==> 4πr

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AR. OF GIVEN CIRCLE : AR. OF NEW CIRCLE

2πr : 4πr

2 : 4

1 : 2 is your answer friend...

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THANK YOU...