180 > x > 90: obtuse
180: straight
360 > x > 180: reflex
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A triangle with an angle whose measures is greater than 90 is called an Obtuse Triangle.
An isosceles triangle
When the angle = 90 degrees, it is a Right Angle. When the angle is greater than 90 degrees, it is an obtuse angle.
An obtuse angle
An equilateral triangle, which has 3 angles of 60o.
Acute