A co-ord geom. question Watch

GrantMac
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#1
Report Thread starter 12 years ago
#1
The point A (-3, - 7) lies on the circle centre (5,1).
Find the equation of the tangent to the circle at A.

i thought i was on the right track but it went wrong.

i was working on the fact thar that the radius/diameter runs parallel to the tangent when you think about it

help appreciated thanks
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-Kav-
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#2
Report 12 years ago
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Hah, I was about to use implicit differentiation but you're nearly there. The radius from the centre to A is perpendicular not parallel. So just work out the gradient of the radius and then the negative reciprocal of that gradient is the gradient of the tangent. After that it's plain sailing.
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