A trapezoidal piece of paper, the lower base is 24 cm, the upper base is 18 cm, and the height is 14 cm. Cut it into a triangular piece of paper as large as possible. Find the total area of the remaining scraps of paper.
一张梯形的纸片，下底是24厘米，上底是18厘米，高14厘米，把它剪成一张尽可能大的三角形纸片，求余下的碎纸屑的总面积．
<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">24 * 7</gadget>
<output>168</output>

<result>168</result>