SAT Math Multiple Choice Practice Question 480: Answer and Explanation

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Question: 480

21.

In the figure above, x || y. What is the value of a in terms of b and c ?

A. b + c
B. 2bc
C. 180 – b + c
D. 180 – bc
E. 360 – bc

Correct Answer: D

Explanation:

D Don't forget that you can plug in on geometry questions. Let's make b = 70° and a = 30°. So the third angle in the triangle is 80°. You know that c would be 80°, because it is opposite an 80° angle. Your target answer is a = 30°, so plug in 80° and 70° to find it. The only possible answer is D.

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