SAT Math Multiple Choice Practice Question 438: Answer and Explanation

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Question: 438

21.

In the figure above, what is the value of a + b + c ?

A. 180
B. 240
C. 270
D. 360
E. It cannot be determined from the information given.

Correct Answer: C

Explanation:

C The number of degrees in a line is 180. Therefore, b + c = 180. And since a + 90 = 180, a = 90. So a + b + c = 270. Note that E is the Joe Bloggs choice—"it cannot be determined" is rarely the correct answer.

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