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, 
is the center of the circle and 
is equilateral. If the sides of 
are of length 6, what is the length of 
?
A. 
B. 
C. 
D. 
E. 
|
正确答案:C 解析: Choice (C) is correct. Since |
is equilateral, each of its angles has measure 
. It follows that 
has measure 
. Since 
and 
are radii of the same circle, they are of equal length, and so 
is isosceles. Hence 
and 
each have measure 
. Thus 
has measure 
, and so 
is a 
right triangle. Since 
, the side opposite the 
angle in 
, is of length 
, it follows that 
, the side opposite the 
angle, is of length 
.
