Obtuse Angle
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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 angle.
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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