Cut the largest triangle out of a trapezoid with an upper base of 6cm and a lower base of 8cm. What is the area of this triangle equal to the area of the trapezoid?
在一个上底6cm，下底8cm的梯形中剪一个最大的三角形，这个三角形的面积是梯形面积的多少
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>