Geometry and TrigonometryEasyOther angle of a linear pair
Geometry and Trigonometry practice question
Two angles form a linear pair, and one of them measures 65°. What is the measure, in degrees, of the other angle?
Answer: 115
A linear pair lies along a straight line, so the two angles add to 180: 180 − 65 = 115.
Common wrong answers
- If you answered 25
- 25 is 90 − 65, treating the pair as complementary; a linear pair adds to 180.
- If you answered 65
- The two angles of a linear pair are equal only when both are 90°.
- If you answered 295
- 295 is 360 − 65; a straight line is 180°, not 360°.
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