In triangle ABC, angle BAC = 35° and angle ABC = 58°. Side BC is extended to a point D. What is the size of angle ACD?
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Worked Solution
Step 1: Use the exterior angle theorem.
An exterior angle of a triangle equals the sum of the two non-adjacent interior angles.
Step 2: Angle ACD = angle BAC + angle ABC = 35° + 58° = 93°
Correct answer: 93°
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