Which angle measures 180 degrees?

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Multiple Choice

Which angle measures 180 degrees?

Explanation:
Angle sizes follow standard categories. A straight angle is the one that measures 180 degrees, made when the two rays form a straight line through the vertex. That exact line direction covers half a circle, hence 180 degrees. The other types never reach that measure: an acute angle is less than 90 degrees, a right angle is exactly 90 degrees, and an obtuse angle is between 90 and 180 degrees but not equal to 180.

Angle sizes follow standard categories. A straight angle is the one that measures 180 degrees, made when the two rays form a straight line through the vertex. That exact line direction covers half a circle, hence 180 degrees. The other types never reach that measure: an acute angle is less than 90 degrees, a right angle is exactly 90 degrees, and an obtuse angle is between 90 and 180 degrees but not equal to 180.

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