**Definition of Obtuse Angle**

- Any angle greater than 90Â° and smaller than 180Â° is called an Obtuse Angle.

**More about Obtuse Angle**

- An angle of 90Â° is called a right angle.
- An angle of 180Â° is called a straight angle.

**Example of Obtuse Angle**

- The angle shown in the figure is greater than 90Â° but smaller than 180Â°, so it is an obtuse angle.

**Solved Example on Obtuse Angle**

Identify the obtuse angle in the given triangle.

Choices:

A. âˆ ACB

B. âˆ ABC

C. âˆ BAC

D. âˆ CAB

Correct Answer: B

Solution:

Step 1:An angle greater than a right angle and less than a straight angle (> 90Â° and < 180â°)="" is="" called="" an="" obtuse="">

Step 2:In the given figure, âˆ A and âˆ C are acute angles and âˆ B is an obtuse angle.

Step 3:So, âˆ ABC is an obtuse angle.

**Related Terms for Obtuse Angle**

- Acute Angle
- Angle
- Right Angle
- Straight Angle