The perimeter of a rectangle with a length of 8 cm and a width of 6 cm is equal to the perimeter of a square with side lengths of cm.
长8厘米，宽6厘米的长方形的周长与边长多少厘米的正方形的周长相等．
<gadget id="calculator">8 + 6</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<result>7</result>