Geometry and TrigonometryMediumAngle in a triangle from a linear pair
Geometry and Trigonometry practice question
In triangle DEF, side DE is extended beyond E to a point G, and angle FEG measures 110°. If angle D measures 40°, what is the measure, in degrees, of angle F?
Answer: 70
Angle DEF is 180 − 110 = 70, so angle F is 180 − 40 − 70 = 70.
Common wrong answers
- If you answered 30
- 30 subtracts 40 from 70 instead of using the triangle's 180.
- If you answered 40
- 40 repeats angle D.
- If you answered 110
- 110 is the exterior angle.
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