Did anyone else think that in question 2 it was strange that the question didn't mention a z axis? I ended up using z co-ordinates of the base to work out the distance from 2 of the edges of the base to the centre of mass of the whole thing. When I'd calculated the distance from each of the 3 edges to the centre of mass, I said that the edge with the smallest distance would require the smallest angle of tilt. But last night I realised I probably should've chosen the one with the greatest distance as it would produce a bigger moment!