Geometry: Types Of Angles
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Angles
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Angles are geometric figures formed by two rays (or line segments) that share a common endpoint called the vertex. Angles are classified based on their measure in degrees.
In geometry, angles can be classified according to the size of the angle.
In this lesson, we will learn the following types of angles:
right angles, acute angles, obtuse angles, straight angles, reflex angles and full angles.
The following table shows the different types of angles: right angles, acute angles, obtuse angles, straight angles, reflex angles and full angles. Scroll down the page if you need more explanations about each type of angles, videos and worksheets.
Math Worksheets
Practice your skills with the following angle worksheets:
Types of Angles
- Acute Angle Definition: An angle that measures greater than 0° but less than 90°.
- Right Angle Definition: An angle that measures exactly 90°. Example: The corner of a square or rectangle.
- Obtuse Angle Definition: An angle that measures greater than 90° but less than 180°.
- Straight Angle Definition: An angle that measures exactly 180°. Example: A straight line.
- Reflex Angle Definition: An angle that measures greater than 180° but less than 360°.
- Full Rotation (Complete Angle) Definition: An angle that measures exactly 360°.
What Are The Types Of Angles?
What Are 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.
The following video explains more about right angles.
What Are Acute Angles?
An acute angle is an angle measuring between 0 and 90 degrees.
What Are Obtuse Angles?
An obtuse angle is an angle measuring between 90 and 180 degrees.
What Are Straight Angles?
A straight angle is a straight line and it measures 180 degrees.
What Are The Differences Between A Right, Acute, Obtuse And Straight Angle?
What Are Reflex Angles?
A reflex angle is an angle measuring between 180 and 360 degrees.
What Are Full Angles?
A full angle is an angle of one complete turn which is 360 degrees.
An angle of one whole turn is 360°.
How To Draw Reflex Angles?
Example:
Draw a 220° angle
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