Geometry and TrigonometryEasy–MediumSame-side interior angle from one angle
Geometry and Trigonometry practice question
Two parallel lines are cut by a transversal. One of the angles formed measures 118°. What is the measure, in degrees, of the same-side interior angle that is paired with it?
Answer: 62
Same-side (co-interior) angles between parallel lines are supplementary: 180 − 118 = 62.
Common wrong answers
- If you answered 28
- 28 is 90 − 62 or 118 − 90; the pair adds to 180, not 90.
- If you answered 118
- 118 is the measure of the corresponding or alternate angle, which are EQUAL to the given angle. Same-side interior angles add to 180.
- If you answered 242
- 242 is 360 − 118. The relevant total is 180.
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