Divide a circle with a diameter of 18 cm into 9 sectors, what is the circumference of each sector in cm?
把直径为18厘米的圆等分成9个扇形，每个扇形的周长是多少厘米．
<gadget id="calculator">18 / 9</gadget>
<output>2</output>

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">6.28 + 18</gadget>
<output>24.28</output>

<result>24.28</result>