21 Guns

the last few times I've posted questions no one has answered them...I'm starting to get kind of upset. let's see if this one gets answered: the perimeter of a square is 44. find the length of a diagonal.

find the altitude of an equilateral triangle if a side is 6 mm long.

thanks for your help (and it hasn't been today, it was over the last few times I have tried to get help from here)