The height of a trapezoid is 6 cm and the area is 34.5 cm2. What is the sum of the upper and lower bases in cm?
一个梯形的高是6厘米，面积是34.5平方厘米，上底和下底的和是多少厘米．
<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">34.5 * (1/3)</gadget>
<output>11.5</output>

<result>11.5</result>