SAT1备考数学练习（四）

　　为了方便广大考生更好的复习，和谐英语网综合整理了SAT1备考数学练习，以供各位考生考试复习参考,希望对考生复习有所帮助。

　　sat考试官方网站每日一题小结，以下是SAT1数学部分。Read the following SAT test question, then click on a button to select your answer.

In the figure above, x = 60 and y = 40. If the dashed lines bisect the angles with measures of x° and y°, what is the value of z?

A.25

B.35

C.40

D.45

E.50

Correct Answer: E

Here"s Why:

First, add the labeled points A, B, C, D, E, and O to the figure, as shown above. Then segment

bisects

AOC, so m

AOB = m

BOC, and m

AOB + m

BOC = x° = 60°. Thus, m

AOB = m

BOC = 30°. Similarly, m

COD = m

DOE = 20°, because

COD and

DOE are of equal measure and the sum of their measures is y° = 40°. From the figure, it follows that z° = m