The 4 types of angles are
1. Acute angle
2. Right angle
3. Obtuse angle
4. Straight angle
The size of these angles are as follow:
1. Acute angles are less than 90°
2. Right angles are equal to exactly 90°
3. Obtuse angles are greater than 90° but less than 180°
4. Straight angles are equal to exactly 180°
Let us have a look at how these angles look like