An angle that measures 180 degrees is called a straight angle.

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Multiple Choice

An angle that measures 180 degrees is called a straight angle.

Explanation:
Recognising angle types by their measures: a straight angle is defined as 180 degrees. This occurs when two rays share a common endpoint and point in opposite directions, forming a straight line. So an angle measuring 180 degrees is a straight angle. An acute angle is less than 90 degrees, and an obtuse angle lies between 90 and 180 degrees, so neither is 180 degrees. An isosceles triangle is a triangle with two equal sides, not an angle measure, so it does not describe a 180-degree angle.

Recognising angle types by their measures: a straight angle is defined as 180 degrees. This occurs when two rays share a common endpoint and point in opposite directions, forming a straight line. So an angle measuring 180 degrees is a straight angle. An acute angle is less than 90 degrees, and an obtuse angle lies between 90 and 180 degrees, so neither is 180 degrees. An isosceles triangle is a triangle with two equal sides, not an angle measure, so it does not describe a 180-degree angle.

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