Four.
No, it has two angles over 90 degrees and two angles below 90 degrees.
Not possible... in order for it to have four right-angles, it would resemble a square or rectangle.
Almost but not quite because a rectangle has 4 equal right angles whereas a parallelogram has 2 equal opposite obtuse angles and 2 equal opposite acute angles.
4
4 right angles, no other angles.
It has 6 angles, none of which are right angles.
0 right angles
A regular hexagon as no right angles. An irregular hexagon could have from none to as many as five right angles.
a tetrahedron has 3 Right angles
A right angle is 90 degrees
2 right angles