If a circle is formed with 18.84 cm long iron wire, what is the area of the circle in square centimeters? (The loss at the joint is not counted)
用18.84厘米长的铁丝围成一个圆，这个圆的面积是多少平方厘米．(接头处损耗不计)
<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

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

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>