Geometry and TrigonometryEasy–MediumObtuse angle at a parallel line
Geometry and Trigonometry practice question
Lines m and n are parallel, and a third line crosses both of them. One of the angles formed at line m measures 65°. What is the measure, in degrees, of an obtuse angle formed at line n?
Answer: 115
The angles at n are 65° and 115°; the obtuse one is 180 − 65 = 115.
Common wrong answers
- If you answered 65
- 65 is the acute angle at line n.
- If you answered 125
- 125 is a subtraction slip.
- If you answered 295
- 295 subtracts from 360.
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