In a trapezoid whose upper base is 15 cm, height is 12 cm, and lower base is 25 cm, cut out the largest triangle, what is the remaining area in square centimeters?
在一个上底为15厘米，高为12厘米，下底为25厘米的梯形中，剪下一个最大的三角形，剩下的面积是多少平方厘米．
<gadget id="calculator">15 + 25</gadget>
<output>40</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">40 * 6</gadget>
<output>240</output>

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

<gadget id="calculator">240 - 150</gadget>
<output>90</output>

<result>90</result>