Cut a triangle from a trapezoid with an upper base of 10 cm, a lower base of 8 cm, and a height of 6 cm. What is the maximum area of the cut part in cm**2.
从一个上底10cm，下底8cm，高6cm的梯形里剪去一个三角形，剪去部分的面积最大是多少cm**2．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 10 * 6</gadget>
<output>30</output>

<result>30</result>