Bind three wooden sticks with a diameter of 8 cm together as shown in the figure, and the rope is only wound twice. At least how many decimeters of rope is needed?
把三根直径是8厘米的木棍，如图捆扎在一起，绳子只绕2圈．至少需要绳子多少分米？
<gadget id="calculator">3.14 * 8</gadget>
<output>25.12</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">25.12 + 24</gadget>
<output>49.12</output>

<result>49.12</result>