a right angle is 90 degrees. 100% of the time.
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Use the pythagorean theorem.
As many as you like providing that they measure 90 degrees.
angles that measure 90 degrees.
If it has no right angles, it is not a right triangle and therefore you cannot name a hypotenuse of that triangle. Which implies you cannot find that side's measure.
4 right angles. A right angle is a 90 Degree measure like for example: L <---- 90 degree measure. And the rectangle has 4 angles like that so it means it has 4 right angles.