A cylinder with a side length of 18.84 cm is used to enclose a cylinder as large as possible. What is the area of the base of the cylinder in square centimeters?
用一张边长是18.84厘米的正方形围成尽可能大的圆柱，这个圆柱的底面积是多少平方厘米．
<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>