SAT官方每日一题:2011年10月16日
2012-03-04来源:互联网
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2011年10月16日
考试类型:Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
In the figure above, inscribed triangle is equilateral. If the radius of the circle is , then the length of arc is
A.
B.
C.
D.
E.
正确答案:A 解析: An equilateral triangle has three equal sides, so the lengths of the three arcs must be equal, and thus each arc is of the circumference of the circle. The circumference of the circle is , so the length of arc is of , or . |