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# C3 circle and co-ordinates quick question

Maths and statistics discussion, revision, exam and homework help.

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1. C3 circle and co-ordinates quick question
Hi,
Ive attached the past paper question which Im stuck on. (Hope its worked) I have the mark scheme, but I don't know how to work it out, I haven't come across a question like this before.
Hopefully somebody will be able to shed some light on it! Many thanks!!!
Attached Thumbnails

2. Re: C3 circle and co-ordinates quick question
Never mind, Ive just checked and its from a FURTHER paper, whoopsie! I would delete this thread but it won't let me
3. Re: C3 circle and co-ordinates quick question
Will get you started. Since OA is the diameter of the circle, and the center of this circle which also happens to be the mid-point of the circle is (3,4), then point A is simply given by (6,8). (Verify the length of OA is 10 units which is indeed equivalent to the diameter of the circle).

k value is simply the length of OA, which is just 10.

Alpha is simply the angle of inclination of OA with respect to the positive x-axis, measured in the anti-clockwise sense.

Some food for thought. Hope it helps. Peace.

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