下面是2014年1月13日的SAT官方每日一题的内容，是关于数学方面的，题型是选择。SAT官方每日一题是collegeboard每天都会发布的题目，关于SAT考试的三个部分的各个题型。大家和澳际小编一起来看一下这个SAT官方每日一题吧。

　　SAT官方每日一题之数学---选择：

　　Mathematics > Standard Multiple Choice

　　Read the following SAT test question and then click on a button to select your answer.

　　In the figure above, a shaded circle with diameteris tangent to a large semicircle with diameterat pointsand. Pointis the center of the semicircle, andis perpendicular to. If the area of the large semicircle is, what is the area of the shaded circle?

　　(A)8

　　(B)10

　　(C)12

　　(D)14

　　(E) It cannot be determined from the information given.

　　The correct answer is C

　　Explanation

　　Segmentis a radius of the large semicircle, and it is also a diameter of the shaded circle, so the radius of the large semicircle is equal to twice the radius of the shaded circle. Letbe the radius of the shaded circle. Thenis the radius of the large semicircle, and so the area of the semicircle is. This area is given as, and so the area of the shaded circle is.

　　下面为大家提供一些和这些SAT官方每日一题相似的题目，供大家练习：

　　A train travelingmiles per hour forhour covers the same distance as a train travelingmiles per hour for how many hours?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

　　The correct answer is B

　　Explanation

　　When the speed of a train in miles per hour is multiplied by the travel time in hours, the distance traveled by the train is obtained. The distance that the first train travels ismiles per hour timeshour, which ismiles. Using the variablor the travel time, in hours, of the second train, the distance that the second train travels ismiles per hour timeshours, which ismiles. Since the two trains travel the same distance,, which giveshours, the travel time of the second train.

　　以上就是关于2014年1月13日SAT官方每日一题中数学部分的详细内容，包括了题目和选项以及答案，后面附有一道相关的练习题。大家可以在备考SAT的过程中关注SAT每日一题的内容，这样就可以更好有不间断的练习，也就能在日积月累的过程中得到提高。

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