Draw the largest circle in a rectangle with a length of 5 cm and a width of 3 cm. What is the area of the circle in cm?
在一个长5厘米，宽3厘米的长方形中画一个最大的圆，这个圆的面积是多少厘米．
<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>