Angle in a plane whose measure is between a right angle and a straight angle.

The measure of an obtuse angle is between 90° and 180°.

### Example

In the figure above, angle *AOB* is an obtuse angle.

Angle in a plane whose measure is between a right angle and a straight angle.

The measure of an obtuse angle is between 90° and 180°.

In the figure above, angle *AOB* is an obtuse angle.