It is known that the perimeter of a parallelogram is 36 cm. Among the two adjacent sides, the length of one side is twice the length of the other side. Find the length of the shorter side in centimeters.
已知一个平行四边形的周长是36厘米，其中相邻的两条边中，一条边长是另一条边长的2倍，求短边长多少厘米．
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">36 / 6</gadget>
<output>6</output>

<result>6</result>