Which angle type has a measure of 180 degrees?

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Multiple Choice

Which angle type has a measure of 180 degrees?

Explanation:
Understanding angle size: a straight angle measures 180 degrees. This happens when the two rays form a straight line, pointing in opposite directions, so the sweep from one ray to the other covers half the circle and totals 180°. The other types have different measures: a right angle is exactly 90 degrees, an acute angle is less than 90, and an obtuse angle is more than 90 but less than 180. Because 180 degrees corresponds to a straight line, it matches a straight angle.

Understanding angle size: a straight angle measures 180 degrees. This happens when the two rays form a straight line, pointing in opposite directions, so the sweep from one ray to the other covers half the circle and totals 180°. The other types have different measures: a right angle is exactly 90 degrees, an acute angle is less than 90, and an obtuse angle is more than 90 but less than 180. Because 180 degrees corresponds to a straight line, it matches a straight angle.

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