The area of a trapezoid is 72 square centimeters. The upper bottom is 10 cm and the lower bottom is 8 cm. What is the height in cm?
一个梯形的面积是72平方厘米．上底是10厘米，下底是8厘米，高是多少厘米？
<gadget id="calculator">10 + 8</gadget>
<output>18</output>

<gadget id="calculator">2 / 18</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">72 * (1/9)</gadget>
<output>8</output>

<result>8</result>