A cylinder whose lateral expansion is exactly a square with a side length of 18.84 cm, what is the area of the base of the cylinder in square centimeters?
一个圆柱它的侧面展开正好是一边长18.84厘米的正方形，圆柱体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>