The lengths of two adjacent sides of a parallelogram are 10 and 8 respectively. If the distance between the longer sides is 4, what is the distance between the shorter sides?
平行四边形两邻边长分别是10和8，若较长边之间的距离是4，那么较短边之间的距离是多少．
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">8 * (2/5)</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>