A rectangle is 7 cm long and 6 cm wide. Draw a largest circle inside this rectangle, what is the area of this circle in square centimeters?
一个长方形长7厘米，宽6厘米．在这个长方形内画一个最大的圆，这个圆的面积是多少平方厘米．
<gadget id="calculator">6 / 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>