A straight line.
Draw a straight line. Make a dot/point on that line. From a point on the line to the left of the dot , sweep an arc to a point on the line to the right of the dot. You will find it to be 180 degrees.
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a straight angle
An angle that measures 180 degrees would be in a straight line. Therefore, this angle is known as a straight angle.
An obtuse angle
sumplementary
The only angle that can measure 180 degrees is a straight line.