piece of trapezoidal cardboard with a height of 8 cm, an upper base of 12 cm, and a lower base of 18 cm. Now cut along the diagonal of the trapezoid and cut it into two triangles. The area of the larger triangle is larger than the area of the smaller triangle How many square centimeters larger.
一张梯形的硬纸板，高是8厘米，上底是12厘米，下底是18厘米，现在沿着梯形的对角线剪开，剪成两个三角形，大三角形的面积比小三角形的面积大多少平方厘米．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">18 * 4</gadget>
<output>72</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">72 - 48</gadget>
<output>24</output>

<result>24</result>