The central angle of a circle is a sector of 60 degrees, and the area is the area of the circle where it is located
圆心角是60度的扇形，面积是所在圆面积的多少
<gadget id="calculator">60 / 360</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>