Discussion
In triangle ABC, angle A = 3x, angle B = 5x, and angle C = 4x. What is the value of x?
Answer: B
The three angles add to 180°.
\[ 3x + 5x + 4x = 12x = 180 \]
\[ x = 15 \]
The angles are then 45°, 75° and 60°.
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