Cut the largest circle out of a rectangle with a length of 6 cm and a width of 5 cm. What is the area of the circle?
在一张长6cm，宽5cm的长方形中剪一个最大的圆，这个圆的面积是多少．
<gadget id="calculator">3.14 * 2.25</gadget>
<output>7.065</output>

<result>7.065</result>