An angle of 90 degrees is a right angle.
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its called a right angle!
Accute because the angle is less than 90 degrees
If you only know one angle, that angle is greater than 90 degrees, then the triangle is obtuse If that angles is equal to 90 degrees, then the triangle is a right triangle. If it is less than 90 degrees, you don't know enough information to classify the triangle.
An angle which has measure between 90 degrees and 180 degrees is an obtuse angle.
An angle greater than 0 but less than 90 degrees is acute An angle greater than 90 but less than 180 degrees is obtuse