Not usually.
Not usually.
perpendicular
No.
It can, but it need not.
no it does not
It doesn't need any in order to be a trapezoid. It can have a max of two pairs of perpendicular sides.
No.
perpendicular
No.
It can, but it need not.
Not usually.
Not usually.
The diagonals of an isosceles trapezoid are equal in lengths but are not perpendicular to each other at right angles.
Yes, an isosceles trapezoid is one example.
yes.
yes