2 of them.
There are no diagonals in any triangle
Yes they are of equal lengths.
Diagonals are not equal but they intersect at right angles
A quadrilateral has 4 sides
Diagonals are equal in a rectangle but not in a parallelogram.
A quadrilateral has 2 diagonals.
A quadrilateral need not have any vertical sides.
A Quadrilateral has two diagonals. IF the quadrilateral is a rectangle, then the two diagonals are equal in length.
A quadrilateral has 4 sides.
4
There are 4 interior angles in a quadrilateral
A quadrilateral has 4 line segments