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Geometry: Types Of Angles

In geometry, angles can be classified according to the size of the angle.
In these lessons, we will learn the following types of angles:
right angles, acute angles, obtuse angles, straight angles, reflex angles and full angles.

Related Topics:
More Geometry Lessons

Right Angles

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

right angle

The following video explains more about right angles.

Acute Angles

An acute angle is an angle measuring between 0 and 90 degrees.

acute angle 40 deg

Obtuse Angles

An obtuse angle is an angle measuring between 90 and 180 degrees.

obtuse angle

Straight Angles

A straight angle is a straight line and it measures 180 degrees.

straight angle

The following video shows the differences between a right, acute, obtuse and straight angle.


Reflex Angles

A reflex angle is an angle measuring between 180 and 360 degrees.

reflex angle

Full Angles

A full angle is an angle of one complete turn which is 360 degrees.

An angle of one whole turn is 360˚.

The following video will distinguish between the different types of angles: right, acute, obtuse, straight, reflex and full angles.


Practice Types of Angles with the following worksheet
Types of Angles - Acute, Obtuse, Reflex

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