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
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A right angle triangle has a 90 degree angle and 2 acute angles An obtuse triangle has 1 obtuse angle and 2 acute angles
A right triangle has one angle that is a right angle (90 degrees). An obtuse triangle has one angle that is obtuse (between 90 and 180 degrees). An acute triangle is a triangle in which all three angles are acute (less than 90 degrees).
A right triangle has one angle a right angle (90o) An obtuse triangle has one angle an obtuse angle (> 90o) An acute triangle has all angles acute (< 90o)
An acute triangle
No, all three angles must be less than 90 degrees each in an acute triangle. In an obtuse triangle one of the angles is greater than 90 degrees. A triangle with a 90 degree angle is called a right triangle.