0 or 2.
A trapezoid can have either zero, one, or two right angles. In the case of a right trapezoid, it has exactly two right angles. However, a general trapezoid may have no right angles at all. Therefore, the number of right angles in a trapezoid varies depending on its specific type.
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.
There must be exactly one.
A shape with 4 right angles would be a square or rectangle. A trapezoid does not have any right angles..
No. A trapezoid need not have any right angles.
An isosceles trapezoid can have either zero, one, or two right angles, depending on its specific dimensions and angles. In a standard isosceles trapezoid, which has one pair of parallel sides and the non-parallel sides being equal in length, it typically has no right angles. However, if designed to have right angles at the base, it can have two right angles.
Four.
It would be impossible. A trapezoid can't have three right angles. It would just make a rectangle.