The definition of a right angle is one quarter of a circle. If you're using the popular system of 360 degrees in a circle, then a right angle is 90 degrees.
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in a 30-60-90 right triangle, a right angle is always 90 degrees, the smallest angle has a measure of 30 degrees, and the remaining angle measures 60 degrees.
About 90 degrees which is a right angle.
A right-angle triangle
If it's a right angle triangle then the the third angle is 60 degrees.
Neither, it is 90 degrees.