Expand the side of a cylinder to get a square. The height of the cylinder is 18.84 cm. What is the area of the base of the cylinder in square centimeters?
将一个圆柱的侧面展开，得到一个正方形，圆柱高是18.84厘米，圆柱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>