1. Types of Angles

2. Types of Angles Acute Angle:
An angle whose measure is less than 90° but greater than 0° is called an Acute angle.
Example: 15°,30°,60°,75°.
Obtuse Angle:
An angle whose measure is more than 90° is called Obtuse angle.
Example: 100°,110°,120°,140°.
Right Angle:
An angle whose measure is 90° is called a Right angle.

3. Straight Angle:
When the rays of an angle are opposite rays forming a straight line, the angle thus formed is a straight angle and its measure is 180°.
Reflex Angle:
An angle whose measure is more than 180° but less than 360° is called a reflex angle.
Complete Angle:
The angle formed by OP and OQ is one complete circle, that is 360°. Such an angle is called a complete angle.

4. Complementary Angle
If the sum of the measures of two angle is 90°, then the two angles are called complementary angles.
The complement of 30°is 60°and the complement of 60°is30°
Supplementary Angle
If the sum of the measures of two angle is 180°, then the two angles are called supplementary angles.
The supplement of 120° is 60° and the complement of 60° is120°

5. Try these
Identify the following angles based on their types
34° , 84° , 103° , 147° , 180° , 275° , 360°
2. Find the supplement angle of 112°?
3. Find the complement angle of 63°?