Draw a sector in a circle with the same radius as the circle, the central angle is 60**0, and the area of the rest of the circle is how many times the area of the sector.
在圆中画一个与这个圆等半径，圆心角是60**0的扇形，圆内其余部分的面积是这个扇形面积的多少倍．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(5/6) / (1/6)</gadget>
<output>5</output>

<result>5</result>