The perimeter of a parallelogram is 44 cm, AB=10 cm, the height on side AB is 9 cm, what is the height on side BC in cm.
一个平行四边形的周长是44厘米，AB=10厘米，AB边上的高是9厘米，BC边上的高是多少厘米．
<gadget id="calculator">10 * 9</gadget>
<output>90</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">44 - 20</gadget>
<output>24</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">90 / 12</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>