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Geometry and Trigonometry
Difficulty: Easy
In triangle , the measure of angle is and the measure of angle is . What is the measure of angle ?
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Explanation
Choice D is correct. The sum of the angle measures of a triangle is . Adding the measures of angles and gives . Therefore, the measure of angle is .
Choice A is incorrect and may result from subtracting the sum of the measures of angles and from , instead of from .
Choice B is incorrect and may result from subtracting the measure of angle from the measure of angle .
Choice C is incorrect and may result from adding the measures of angles and but not subtracting the result from .