what is a diacnal
It has 2 diagonals
There are 27 diagonals in a nonagon.
12 diagonals
405 diagonals
Yes
rhombus
Diagonals? Only if you're cheating.
Yes unless it is parallelogram
squares
8+7+6+5+4+3+2+1 = 36 diagonals
A square, a rectangle and an isosceles trapezoid