Geometry and TrigonometryHardExterior angle from two remote interior angles
Geometry and Trigonometry practice question
In triangle ABC, angle A measures 40° and angle B measures 75°. Side BC is extended beyond C to a point D. What is the measure, in degrees, of angle ACD?
Answer: 115
The exterior angle at C equals the sum of the two remote interior angles: 40 + 75 = 115.
Common wrong answers
- If you answered 35
- 35 is the difference of the given angles.
- If you answered 65
- 65 is angle ACB, the interior angle.
- If you answered 140
- 140 subtracts 40 from 180.
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