The area of a trapezoid is 36 square centimeters, its upper base is 3 cm, and its height is 8 cm. What is its lower base in cm?
一个梯形的面积是36平方厘米，它的上底3厘米，高8厘米，它的下底多少厘米．
<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">36 * (1/4)</gadget>
<output>9</output>

<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<result>6</result>