Xiao Ming surrounds the rectangular tabletop with a 16-decimeter rope, which can be circled twice. What is the perimeter of the rectangular tabletop?
小明用16分米的绳子围长方形的桌面，正好可以围两圈，长方形桌面的周长多少．
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>