Anyone else like maths?! Anyway, I was wondering if anyone could point me in the direction (Read: I don't just want the answer on a plate) of solving this (attached). Obviously RCB is 90-34=56, but from there I have no idea where to go. I was thinking that in a cyclic quadrilateral opposite vertices add up to 180 degrees, but then of course OCDA isn't cyclic. Once you get ABC then OAD should be easy, just 360-(2ABC)-137-72. Any ideas?