Geometry and TrigonometryEasy–MediumSum of the other three angles at an intersection
Geometry and Trigonometry practice question
Two lines intersect, forming four angles. One of the angles measures 40°. What is the sum, in degrees, of the other three angles?
Answer: 320
The four angles around a point sum to 360°, so the other three sum to 360 − 40 = 320.
Common wrong answers
- If you answered 140
- 140 is the supplement of 40.
- If you answered 280
- 280 subtracts 40 twice.
- If you answered 320.5
- 320.5 is a slip.
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