There is a trapezoid with an area of 36 square centimeters, an upper base of 3 cm and a lower base of 9 cm, what is its height in cm?
有一个梯形的面积是36平方厘米，上底是3厘米，下底是9厘米，那么它的高是多少厘米．
<gadget id="calculator">3 + 9</gadget>
<output>12</output>

<gadget id="calculator">2 / 12</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">36 * (1/6)</gadget>
<output>6</output>

<result>6</result>