Diagonals? Only if you're cheating.
what is a diacnal
rhombus
It has 2 diagonals
Yes
12 diagonals
There are 27 diagonals in a nonagon.
squares
405 diagonals
Yes unless it is parallelogram
rhombus/square.
A square, a rectangle and an isosceles trapezoid
No. Hiv is not allowed in Scrabble.