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