Types of Angles – Acute, Right, Obtuse, Straight and Reflex Angles

There are six types of angles: acute, right, obtuse, straight, reflex, and full.

An acute angle is an angle that is less than 90 degrees.

A right angle is an angle that is 90 degrees.

An obtuse angle is an angle that is greater than 90 degrees but less than 180 degrees.

A straight angle is an angle that is 180 degrees.

A reflex angle is an angle that is greater than 180 degrees.

A full angle is an angle that is 360 degrees

Parts of an Angle

The vertex is the point where the two rays of the angle meet. The two rays are the sides of the angle. The measure of an angle is the distance between the vertex and the two rays.

How to label Angles?

Angles can be labelled in a number of ways. One way is to use the degree measure of the angle. Another way is to use the name of the angle.

Positive and Negative Angles

In mathematics, angles may be positive or negative depending on their orientation. A positive angle is one that is measured in a counterclockwise direction from the 0 degree line, while a negative angle is one that is measured in a clockwise direction from the 0 degree line.

The Magnitude of an Angle

The magnitude of an angle is the size of the angle. The magnitude of an angle is measured in degrees (°) or radians (rad).

How to measure Different Types of Angles?

There are three main ways to measure angles: using a protractor, using a ruler, and using trigonometry.

Types of Non-adjacent angles-

Vertical angles-

Vertical angles are two angles that share a common vertex and line of sight. They are always supplementary, meaning that their sum is 180°.

Line angles-

Line angles are two angles that share a common line. They are always supplementary, meaning that their sum is 180°.