Which type of angle measures exactly 180 degrees?

Prepare for your Leaving Certificate Mathematics exam with a comprehensive practice test featuring key definitions. Use flashcards, multiple choice questions, and detailed explanations to ensure success and mastery of fundamental math concepts.

Multiple Choice

Which type of angle measures exactly 180 degrees?

Explanation:
A straight angle is defined by two rays that lie on the same line but point in opposite directions, so the rotation from one side to the other spans a full straight line. That makes its measure exactly 180 degrees. In contrast, an acute angle is smaller than 90 degrees, a right angle is exactly 90 degrees, and a reflex angle is greater than 180 degrees but less than 360. So the straight angle is the one that measures 180 degrees.

A straight angle is defined by two rays that lie on the same line but point in opposite directions, so the rotation from one side to the other spans a full straight line. That makes its measure exactly 180 degrees. In contrast, an acute angle is smaller than 90 degrees, a right angle is exactly 90 degrees, and a reflex angle is greater than 180 degrees but less than 360. So the straight angle is the one that measures 180 degrees.

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