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circles


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#1 william

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Posted 17 March 2007 - 06:05 PM

just doing bit of revision and i got stuck on this circle question.

find the equations of the tangents with the gradient 2 to the circle with the equation x2 + y2 -4x - 6y -7 = 0 stating the coordinates of the points of contact.


"millis times ten to the power of minus 3 yeah?"

#2 John

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Posted 17 March 2007 - 06:40 PM

start by finding the equation of the radius

from there you find the line perpendicular to to the radius

I think you can go on from there.





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