If a sector with a central angle of 45 is cut off from a circle, the area of the remaining part is how many times the area of the cut part.
在圆内剪去一个圆心角为45的扇形，余下部分的面积是剪去部分面积的多少倍．
<gadget id="calculator">360 - 45</gadget>
<output>315</output>

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

<result>7</result>