The upper base of a trapezoid is 3.4 cm, the height is 6 cm, and its area is 30 cm2. How many centimeters is the bottom of the trapezoid?
一个梯形的上底是3.4厘米，高6厘米，它的面积是30平方厘米．这个梯形的下底是多少厘米？
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<gadget id="calculator">10 - 3.4</gadget>
<output>6.6</output>

<result>6.6</result>