SAT Math Multiple Choice Practice Question 480: Answer and Explanation
In the figure above, x || y. What is the value of a in terms of b and c ?
A. b + c
B. 2b – c
C. 180 – b + c
D. 180 – b – c
E. 360 – b – c
Correct Answer: D
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.