An angle of 72 degrees is acute.
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Equilateral, Isosceles, and Scalene If you're talking about the angles though, it can be a right triangle, obtuse triangle, or actue triangle.
Acute angles are angles less than 90 degrees an obtuse angles are greater than 90 degrees
Yes, as for example 78 degrees and 102 degrees would form a supplementary angle of 180 degrees.
Obtuse angles are greater than 90 degrees but less than 180 degrees. Straight angles are exactly 180 degrees. Reflex angles are greater that 180 degrees.
its a right angle