60 degrees: acute
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A right-angle triangle.
Each interior angle of a regular is 108 degrees which is an obtuse angle and each exterior angle is 72 degrees which is an acute angle
right angle triangle
45 degrees is an angle, not a triangle.A triangle containing an angle of 45 degrees can be any kind of triangle except an equilateral triangle.
A right triangle is a triangle with a right angle.a right triangle is a triangle with 1 side as a right angle