A circle and two lines

Hi,
There is a point P(x,y). which is intersect by two lines. These two lines make a circle, with r. I need to know, coordinate of A or B. I cant figure out this by using math theorems.
You can see what i mean with picture at link
[http://img24.imageshack.us/img24/497/71539920.png]

somethg wrote:
Hi,
There is a point P(x,y).OK so far.
which is intersect by two lines.How do lines 'intersect' a point?
These two lines make a circle, with r.Even more obscure.
I need to know, coordinate of A or B.What are A and B?
I cant figure out this by using math theorems.Not surprising, since you can't express the requirement clearly and concisely. That's the first thing to take care of.
You can see what i mean with picture at link
[http://img24.imageshack.us/img24/497/71539920.png]
Blocked for me, and I imagine it would be blocked for many other members too.
Recommended reading: http://catb.org/~esr/faqs/smart-questions.html
db

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