Probably a mis-spelling of "diagonals".
Congruent and they bisect each other too.
six
No but they intersect each other at right angles
3
A square and a rhombus
a triangle has 0 diagnols
no
8
It is an octagon
2
Probably a mis-spelling of "diagonals".
2
A polygon with n sides has n*(n-3)/2 diagonals (not diagnols!).So, an octagon has 8*5/2 = 20 of them.
44
35
None