The central angle of a sector is 60°, and the arc length it subtends is 6.28cm. Find the area of the sector.
一个扇形的圆心角为60°，所对的弧长为6.28cm，求扇形的面积．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">6.28 / (1/6)</gadget>
<output>37.68</output>

<gadget id="calculator">37.68 / 3.14 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">60 / 360</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3.14 * 36 * (1/6)</gadget>
<output>18.84</output>

<result>18.84</result>