Not usually.
perpendicular
No.
It can, but it need not.
Not usually.
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.
Not usually.
perpendicular
No.
It can, but it need not.
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