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|dw:1354534273826:dw| thats what i get as a drawing but i cant seem to get the good equations :/

so, you have two unknowns.

oh dear its going to look ugly though... I'll try it out and see if i need further help

definitely looks like it. good luck. :) okay.

im getting \(A=9r-r^2\) though....

therefore (pi)(r)^ 2 * ( (18-6(pi)r) / 2 * 2r)

\(\pi r + 2r + 2y=18\)
\(y=9-\frac{(\pi+2)r}{2}\)
sub into \(A=\frac{\pi r^2}{2} + ry\)

yes, but one side is covered by the semicircle, so one of its side isn't in the perimeter.

|dw:1354537063461:dw|

there you go, thats where i screwed up... god I'm retarded...

lol nah, i think it's because my drawing is damn ugly. lol

ah! got it hahahaha thanks a lot mate! :D

lol you're welcome :)