cylinder is unfolded to obtain a square. The diameter of the bottom of the cylinder is 1.5 decimeters. What is the area of the square after unfolding?
一个圆柱体侧面展开后得到一个正方形，这个圆柱体的底面直径是1.5分米，展开后正方形面积是多少平方分米．
<gadget id="calculator">3.14 * 1.5</gadget>
<output>4.71</output>

<gadget id="calculator">4.71 * 4.71</gadget>
<output>22.1841</output>

<result>22.1841</result>