Geometry and TrigonometryMediumAngle that is twice another in a triangle
Geometry and Trigonometry practice question
In triangle ABC, the measure of angle A is twice the measure of angle B, and angle C measures 60°. What is the measure, in degrees, of angle A?
Answer: 80
A + B = 120 and A = 2B, so 3B = 120, B = 40 and A = 80.
Common wrong answers
- If you answered 40
- 40 is angle B.
- If you answered 60
- 60 is angle C.
- If you answered 120
- 120 is A + B.
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