If the lateral area of the cylinder is 188.4 square decimeters and the height is 10 decimeters, what is the area of the bottom of the cylinder in square decimeters?
若圆柱的侧面积是188.4平方分米，高是10分米，圆柱的底面积是多少平方分米．
<gadget id="calculator">188.4 / 10 / 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>