Straight Angle – Definition With Examples - Math Monks
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Search Last modified on August 3rd, 2023
chapter outline
- What is a Straight Angle
- Straight Angles in Real Life
- Facts to Remember
What is a Straight Angle
A straight angle, also known as a 180-degree angle, is defined as an angle that measures exactly 180°. It forms a straight line whose arms lie in opposite directions from the vertex. It is thus also called ‘flat angle’ and is represented using the symbol π (pie).

A few more examples of straight angle are shown below:

Straight Angles in Real Life
- Hands of a clock showing 6’ o clock
- Corner of an inclined plane of a staircase
- The angle in a see-saw
Facts to Remember
A straight angle:
- Can be formed by rotating one arm of an angle by 180° with respect to the other
- Can be formed by joining two right angles
- Measures exactly half of a revolution
Which of the following options given in the clock timing forms a straight angle?
As we know, Straight angles are angles that measure 180° Hence, option (d) is a straight angle
Last modified on August 3rd, 2023
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