The sum of the upper and lower bases of a trapezoid is 6m, and the height is 20m. What is the area of the trapezoid in m**2.
一个梯形面积的上底、下底之和是6m，高是20m，这个梯形面积是多少m**2．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 6 * 20</gadget>
<output>60</output>

<result>60</result>