If you should understanding of the question and attempting to solve it they try to give as many as possible. You must set out proofs and show questions appropriately, because these ARE prove/show, which requires some derivation and not just putting a line of 'working' and then jumping to the answer they gave you.
For geometry proofs, MAKE IT EASY FOR THE MARKER!! My teacher used to be a senior marker and she said whoever got the geometry question got, so to speak, the short straw. They take ages to mark as everyone has a different approach. MAKE IT EASY for them so they can happily give you marks! Don't assume anything and when putting in pronumerals, STATE IT => Let andleBAC = theta etc.etc. Then they can follow your proofs easier!
But yeah, as long as you have shown understanding and working they will give marks. Diagrams will attract marks if it shows understanding!