The sum of the upper and lower bases of a trapezoid is 12 decimeters, and the height is 6 decimeters. The base of a parallelogram equal to its area is 12 decimeters. Find the height of the parallelogram.
一个梯形的上、下底之和是12分米，高是6分米，与它面积相等的平行四边形的底是12分米，求平行四边形的高．
<gadget id="calculator">6 / 2 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12 * (1/4)</gadget>
<output>3</output>

<result>3</result>