Apparently a common incorrect error was h/5=r/2 which is pretty much using simliar triangles but with the wrong values. So it seems like a lot of ppl just used that technique without thinking about what they were doing.
Going to be interesting to see what they throw at us tomorrow!
lol damn thats what i did :\ ! I knew i was wrong even before i got to the end of the question and realised for a minimum the r had to be 0, according to my h value, but i couldnt figure out why..
i hope it's a gradient question, those are not difficult, literally year 7-8 applied maths with year 12 knowledge.
edit: epic post count, something to do with demons and the devil
to answer the question to the person below;
'valvoline'
to answer the second question;
'you know what i mean'