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OpenStudy (anonymous):
the lenght of the common cord of the circle x^2+y^2+5x+7y+9=0 and x^2+y^2+7x+5y+9=0 is : a) 9 b)8 c)7 d)6
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OpenStudy (shubhamsrg):
this is much easier to solve geometrically.
OpenStudy (anonymous):
|dw:1373191147040:dw|
OpenStudy (shubhamsrg):
|dw:1373191229406:dw| mark the important co-ordinates.
OpenStudy (shubhamsrg):
and find out the radius (same for both circles)
OpenStudy (anonymous):
alright
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OpenStudy (anonymous):
my answer is 6 .
OpenStudy (anonymous):
is it ?
OpenStudy (shubhamsrg):
yep. correct
OpenStudy (anonymous):
^^
OpenStudy (anonymous):
and thanks once again !
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OpenStudy (shubhamsrg):
glad t help again
OpenStudy (shubhamsrg):
to*
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