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Here, <ABC measures 30˚, which is more than 0˚ and less than 90˚.
Examples: corner of the pizza slice.

3. Obtuse Angle: An angle that measures more than 90˚ and less than 180˚ is
called an obtuse angle.

Here, <XYZ = 120˚, which is more than 90˚ and less than 180˚.

Example: opening of the Chinese fan forms an obtuse angle.

4. Straight Angle: An angle that measures exactly 180˚ is called as a straight angle.

Here, <XOY = 180˚.