A piece of rectangular paper is 25 cm long and 12 cm wide. Cut out the largest triangle from this rectangular paper. How big is the remaining area?
一张长方形纸长25厘米，宽12厘来，从这张长方形纸中剪下一个最大的三角形．剩下的面积有多大？
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">25 * 6</gadget>
<output>150</output>

<result>150</result>