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[Post New] 27 Jan 2012 23:02:56 IST
   Subject: there are two circles whose equations are x^2 + y^2 =9 and x^2 +y^2 -8x-6y+n^2 =0, n belongs to
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samvarun rajulapati (5)

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there are two circles whose equations are x^2 + y^2 =9 and x^2 +y^2 -8x-6y+n^2 =0, n belongs to I,hav exactly two common tangents.Then the no. of possible values of n ??
    
[Post New] 28 Jan 2012 07:39:30 IST
   Subject: circles
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prahlad kumar sharma (220)

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to have exactly two common tangetns the circles must have to intersect each other at two points

so, r1+r2(distance between their centres)

solve this inequality and u wll get d ans.
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