An angle is formed when two straight lines meet at a set point. In other words, an angle is the inclination to each other of two straight lines, which meet at point as shown.

**Types of Angles**

The unit of measurement of angles is the degree, and the instrument used to measure the value or magnitude of an angle is called a *protactor.*

A **right angle** is an angle measuring 90°. Two lines or line segments that meet at a right angle are said to be perpendicular.

An **acute angle** is an angle measuring between 0 and 90°.

An **obtuse angle** is an angle measuring between 90° and 180°.

A **straight angle** is a straight line and it measures 180°.

A **reflex angle** is an angle measuring between 180° and 360°.

**Complementary angles** definition is either of two angles that added together produce an angle of 90°.

**Supplementary angle** is when the sum of two angles located side by side is equal to 180°.

**ASSESSMENT**

- What is an angle?
- List 5 types of angles.
- What is an angle measuring between 180° and 360°
- What is the unit of measurement of an angle?
- What is the instrument used for measuring angles?

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