right-angled trapezoid, the upper base is 12 decimeters, and the lower base is 28 decimeters. If a square is cut from this trapezoid, what remains is exactly a triangle. What is the area of this triangle in square decimeters?
一个直角梯形，上底是12分米，下底是28分米，如果从这个梯形中剪去一个正方形，剩下的正好是一个三角形．这个三角形的面积是多少平方分米？
<gadget id="calculator">28 - 12</gadget>
<output>16</output>

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

<gadget id="calculator">16 * 6</gadget>
<output>96</output>

<result>96</result>