piece of trapezoidal iron sheet is 16 decimeters high, 16 decimeters upper, and 4 decimeters longer than the upper bottom. It is cut into two triangles along the diagonal of the trapezoid. How much larger is the area of the larger triangle than the smaller triangle?
一块梯形铁皮，高16分米，上底16分米，下底比上底多4分米，沿梯形对角线剪成两个三角形，大三角形面积比小三角形面积大多少？
<gadget id="calculator">16 + 4</gadget>
<output>20</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">16 * 8</gadget>
<output>128</output>

<gadget id="calculator">160 - 128</gadget>
<output>32</output>

<result>32</result>