Coordinate geometry question (1 Viewer)

[jonathan_lam]

Hello,
I keep getting stuck on this question. It gets a bit messy.



I already did part (a) - the point A (and hence B,C,D) all lie on the circle given... just parts b, c, d I need.

 

[braintic]

If you know that A lies on the given circle, then you already know the answer to part (a).

If you need the working:

 

[rand_althor]

Hello,
I keep getting stuck on this question. It gets a bit messy.

Didn't you make these questions yourself Jono?

 

[braintic]

Oops - just reread - you CAN do part (a).

For (ii), perhaps use the fact that the x and y coords are actually the t-formulae.
But it still gets way too messy for 2 marks.

 

[jonathan_lam]

Didn't you make these questions yourself Jono?

I got the question from David Monk, who wrote a book with geometry questions. I decided to chuck it in the trial, without solutions. Alternate solutions involving other parametrisations or complex numbers or just euclidean geometry would be interesting as well.