The area of the sector where the central angle of 72° is located is 31.4 square centimeters, what is the area of the circle where this sector is located?
72°圆心角所在的扇形面积是31.4平方厘米，这个扇形所在的圆面积为多少平方厘米．
<gadget id="calculator">72 / 360</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">31.4 / (1/5)</gadget>
<output>157</output>

<result>157</result>