If it measures 90 degrees, then it is called a right angle.
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It is a right angle triangle and the 3rd angle will measure 30 degrees
It is a right angle triangle providing that the 3rd angle is 30 degrees.
A right angle triangle always has a 90 degree angle and two acute angles which altogether add up to 180 degrees.
an acute angle is less than 90 degrees; an angle of more than 90 degrees is called an obtuse angle
An angle that measures more than 90 degrees is called an obtuse angle.