yea i fudged that question aswell.. shouldve read the whole thing.. coz i assumed the cyclic quad was the one in the diagram, (the one with a circle around it!)
i said let sum angle = a, let the other one = b, so whatevvr angle = a +b
any chance at one out of the 2 marks?!
second part AD = rM, where M is a variable ? doubt that'd get the one mark
lol dude i did everything in algebra.
i didnt know you could assume that AD was diameter. for ii i go
Construct DX such that DX is a diameter of the circle
then i go DX = (2r)<sup>2</sup> = pythagoras bla.
Damn diagram, so misleading. They drew angles so wrong. How can two opposite angles of a cyclic quad add to equal 180 when they're drawn to be both obtuse... *grumble grumble * "not to scale" *grumble grumble*