A rectangular iron plate is 48cm long and 30cm wide. It is necessary to saw the largest circle on this iron plate. What is the area of this circle in square centimeters?
一块长方形的铁板，长48cm，宽30cm，要在这块铁板上锯下一个最大的圆，这个圆的面积是多少平方厘米？
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 ** 2</gadget>
<output>225</output>

<gadget id="calculator">3.14 * 225</gadget>
<output>706.5</output>

<result>706.5</result>