Dictionary Definition
The Oxford English Dictionary defines a straight angle as "an angle of 180°."Real Examples of Straight Angles
The angles below are all straight angles:
What's in a Name?
A straight angle is called straight because it forms a straight line.Do a 180
A straight angle is half a revolution, it changes the direction to point the other way.
The phrases "do a 180", "a complete 180" refers to someone who completely changes their mind or direction the other way.
Two Right Angles
A straight angle is two right angles because 180° = 2 × 90°.
Supplementary Angles
Two angles are supplementary if they add up to a straight angle.
Drag and Drop Game
Here is a drag-and-drop game to help you learn about the types of angles.
This page was written by Stephen Clarke.
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