What is the area of a sector with a central angle of 40° to the area of the circle on which it is located?
圆心角是40°的扇形面积是所在圆面积的多少
<gadget id="calculator">40 / 360</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>