OBTUSE ANGLE
Definition of Obtuse Angle
Any angle greater than 90� and smaller than 180� is called an Obtuse Angle.
More About Obtuse Angle
 An angle of 90� is called a right angle.
 An angle of 180� is called a straight angle.
Example of Obtuse Angle
Video Examples: Acute and Obtuse Angles in Geometry
Solved Example on Obtuse Angle
Ques: Identify the obtuse angle in the given triangle.
Choices:
A. ?ACBB. ?ABC
C. ? BAC
D. ?CAB
Correct Answer: B
Solution:

Step 1: An angle greater than a right angle and less than a straight angle (> 90� and < 180?)="" is="" called="" an="" obtuse="">
Step 2: In the given figure, ?A and ?C are acute angles and ?B is an obtuse angle.
Step 3: So, ?ABC is an obtuse angle.
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