Geometry and TrigonometryEasy–MediumSame-side interior angles at parallel lines
Geometry and Trigonometry practice question
Two parallel lines are cut by a transversal. A pair of same-side interior angles measures 3x° and x°. What is the value of x?
Answer: 45
Same-side interior angles add to 180: 3x + x = 180, so x = 45.
Common wrong answers
- If you answered 60
- 60 divides 180 by 3.
- If you answered 90
- 90 assumes the angles are equal, as if they were alternate angles.
- If you answered 135
- 135 is the larger angle, 3x.
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- Easy–Medium
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What is the measure, in degrees, of angle B? - Easy–Medium
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