There's a square drawn here and it's diagonal is shown as being 6sqrt3 cm long
and i have to find the perimeter..how do i do this?
it would be good if you told us your difficulty. if you have trouble setting up the sine, cosine and tangent trig ratios, say so, and we can address it. if your problem was the algebra, then Mr. Fantastic already addressed that. do you understand the problem now? or is there something else?