Straight Angle
An angle that measures 180 degrees
A straight angle is a type of angle that measures exactly 180 degrees. It forms a straight line and consists of two opposite rays that meet at a common endpoint, called the vertex. In other words, a straight angle looks like a horizontal line. The two rays forming the straight angle are referred to as the arms.
Since a straight angle measures 180 degrees, it is considered a half-circle or a semicircle. It is the largest possible angle and cannot be further extended.
In geometry, angles are commonly measured in degrees. A degree is a unit of measurement for angles, where a full circle is divided into 360 equal parts. Each part is called a degree. So, a straight angle takes up half of a circle’s measure, which is 180 degrees.
Examples of situations where a straight angle may be found include a ruler lying flat on the table, a level indicator indicating a perfectly horizontal position, or the position of hands on a clock when it is 6 o’clock.
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