A piece of rectangular paper with a length of 12 cm and a width of 10 cm is cut into the largest circle. What is the area of this circular piece of paper in square centimeters?
一张长方形的纸，长I2cm，宽10cm，把它剪成一个最大的圆，这个圆形纸片的面积是多少平方厘米？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<result>78.5</result>