SAT Math Multiple Choice Practice Question 242: Answer and Explanation

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Question: 242


In the figure above, three lines intersect in a single point. What is the value of a + b?

A. 20
B. 54
C. 126
D. 146
E. 252

Correct Answer: D


D Since vertical angles are equal, . Since angles that form a straight line have a sum of 180°, . Therefore . So .

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