The lid of the birthday cake bought by Xiaoli is round, and its diameter is measured to be 3 decimeters. Find the area of the lid.
小丽买的生日蛋糕的盒盖是圆形的，量得它的直径是3分米，求这个盒盖的面积．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) ** 2</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">3.14 * (9/4)</gadget>
<output>7.065</output>

<result>7.065</result>