Yes.
No. A small pentagon will have smaller diagonals than a large pentagon! However, all the diagonals of a regular pentagon will be congruent.
A pentagon has 5 diagonals.
yes
Regular polygons. A square and rectangle will have congruent (equal length) diagonals.
All regular polygons.
True
A regular polygon.
what is the perimeter of a pentegon?
No, kites do not have congruent diagonals.
are the diagonals in a trapezoid congruent
The diagonals are perpendicular, but not necessarily congruent.
Any regular polygon. Lots of irregular polygons can also have congruent diagonals, for example a kite. The answer should not be "a square" because it is a rectangle - a special case but a rectangle nevertheless.