0 or 2.
Two.
A right trapezoid has at least two right angles.
A trapezoid can have either none or two right angles.
A trapezoid may have two right angles.
A trapezoid can have up to two right, 90 degree angles for it still to be classified as a trapezoid.
A shape with 4 right angles would be a square or rectangle. A trapezoid does not have any right angles..
There must be exactly one.
No. A trapezoid need not have any right angles.
Four.
It would be impossible. A trapezoid can't have three right angles. It would just make a rectangle.
A trapezoid has four sides, where two of it's sides are opposite and parallel. If a trapezoid has two right angles that are adjacent to one another, it is called a right trapezoid.
Yes, a trapezoid can have 3 right angles.