straight angle
an angle that measures 180 degrees
A straight angle is an angle that measures exactly 180 degrees. It is formed by a straight line that goes from one point to another and it splits the plane into two equal parts, creating two rays in opposite directions from a common point. Thus, the two rays are the sides of the straight angle and they point in opposite directions.
Some examples of straight angles are line segments AB and AC that form angle BAC, where angle BAC measures 180 degrees. Another example is a line segment CD that splits the plane into two equal parts, creating two rays CE and CF. Angle ECF is a straight angle, as it measures exactly 180 degrees.
It’s worth noting that a straight angle is neither acute nor obtuse. Acute angles measure less than 90 degrees, while obtuse angles measure more than 90 degrees.
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