If the circumference of the circle where a sector is located is 18.84 cm, and the central angle is 30°, what is the area of the sector?
一扇形所在圆的周长是18.84厘米，圆心角为30°，则扇形的面积是多少．
<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">3.14 * 9 * (1/12)</gadget>
<output>2.355</output>

<result>2.355</result>