.Arc=弧度
因为是equilateral triangle（等边三角形）,arc AB,BC,CA的长度必须是相等的.也就是说,Arc ABC的长度是24的话,这三段Arc分别是12,那这个圆的周长就是36.
周长的公式：P= πd
d是直径,所以就是P÷π,周长除以 π而已.
36÷3.14=11.46.最接近的数字是11.所以是C.
恩.结论就是,基本公式要背熟
In the figure above,equilateral triangle ABC is inscribed in
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