What is the area of a circle whose circumference is 18.84 cm? (take 3.14)
一个周长是18.84厘米的圆，它的面积是多少？(兀取3.14)
<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>