What is the perimeter of a parallelogram with adjacent sides of 8 cm and 4 cm?
相邻两边为8厘米和4厘米的平行四边形的周长是多少厘米
<gadget id="calculator">8 + 4</gadget>
<output>12</output>

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

<result>24</result>