# 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.