Multiple choice

Adjacent angles are two angles whose union is a straight angle and whose intersection is a ray. What is the sum of adjacent angles?

  1. 90 degree

  2. 180 degree

  3. 360 degree

  4. 120 degree
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Adjacent angles that form a straight angle (also called a linear pair) always sum to 180 degrees. This is because a straight angle measures exactly 180 degrees by definition, and adjacent angles share a common vertex and ray.

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