A = 1/2(xy) I am pretty sure.Fish Sauce said:Yeah I forgot how to find the area of a rhombus too. I used 1/2 times the diagonals which I think is right. It came out with a nice number, anyway.

I just realised, looking at the solutions, I think I messed up 4)c) iv and v ... did they mean the sum of all shaded regions as in everything shaded (the circles as well or just OACB)?

I'm not sure whether I messed up the acceleration bit of 5 b)ii), but I'm pretty sure I got the other bit right.

I was surprised to learn that I got 6a right.

Other than that, 8a completely screwed me over (I didn't think to use simultaneous equations) and I didn't have time to check out 8b, but I may have got more right than I expected.