# circle coordinate geometry helpWatch

#1
This question has three parts to it, two of which I did already. this is what I have so far:
Attachment 799814 Attachment 799816 however I'm not sure how to work out the last part. any help is appreciated, thanks
0
3 weeks ago
#2
(Original post by thenextchemist)
This question has three parts to it, two of which I did already. this is what I have so far:
however I'm not sure how to work out the last part. any help is appreciated, thanks
Your approach is slightly incorrect. That's not the equation of the tangent; its the equation of the line through X and P. You can technically use the tangent equation approach, but that is quite long winded.

XYP is a right-angled triangle with the right-angle at Y. Hope it's obvious.

If you can determine the length and then you can use Pythagoras' Theorem to work out the length .

Last edited by RDKGames; 3 weeks ago
0
#3
(Original post by RDKGames)
Your approach is slightly incorrect. That's not the equation of the tangent; its the equation of the line through X and P. You can technically use the tangent equation approach, but that is quite long winded.

XYP is a right-angled triangle with the right-angle at Y. Hope it's obvious.

If you can determine the length and then you can use Pythagoras' Theorem to work out the length .

thank you!!
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