Acute: 0 < X < 90; Right: = 90; Obtuse: 90 < X < 180; Straight: = 180; Reflex: 180 < X < 360. The Acut, Right, Straight and Reflex are actually classifications of an angle. Naming of an angle is done by identifying the vertex and a combination of the vertex and points on the two rays. For example an angle with points ABC where B is the vertex and A and C are points on the accompanying rays may be named as angle B, angle ABC or angle CBA. These can be written with the symbol for angle placed before the B the ABC and the CBA.
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Obtuse triangle: a triangle with one angle greater than 90 degrees.
the name of an f angle is a corresponding angle
Triangle means 3 angles. No other shape exists and any three angle shape is a triangle
Corresponding Angle
CEB