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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 
.