Cut off a largest sector with a central angle of 45 degrees in the circle, and the area of the remaining part is how many times that of the cut part.
在圆内剪去一个圆心角为45度的最大扇形，余下部分的面积是剪去部分的多少倍．
<gadget id="calculator">360 - 45</gadget>
<output>315</output>

<gadget id="calculator">315 / 45</gadget>
<output>7</output>

<result>7</result>