A right(-angled) triangle
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If a triangle has a 100 degree angle, it is an obtuse triangle because a 100 degree angle is an obtuse angle. angle > 90 = obtuse angle = 90 = right angle < 90 = acute
A right triangle has a 90 degree angle in it. This is not to be confused with a wrong triangle, which has two 90 degree angles.
A triangle with a 90 degree angle and two acute angles is a right angle triangle.
A right triangle.
a right triangle