You can spot right angles in doors, books or the edge of a piece of paper. An acute angle is less than 90°. It might look small and sharp, like the corner in a slice of pizza. An obtuse angle is ...

The most common types of angles include: Acute angle: Less than 90°. Right angle: Exactly 90°. Obtuse angle: More than 90° but less than 180°. Straight angle: Exactly 180°. The amount of ...