In a right triangle there is only one acute angles.
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One of them.
There is one pair of parallel sides. A trapezoid can have at most one right angle. Not all trapezoids have right angles.
A right angle only has one angle.
There are four right angles in a rectangle.
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one.
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There are four right-angles (90 degrees), one in each corner of the square.
One right angle = 90 degrees so 180 degrees = 2 right angles.
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There are two angles: one of 90 degrees and the other of 270 deg.
A hexagon has only one face and this can have up to 5 right angles.
A triangle can have at most one right angle.
As there are 180 degrees in every triangle, and you have to have three angles, you can only have one right angle.