Master Zhang tied three cylinders with a diameter of 10 centimeters together with a rope (not counting the joints). How many centimeters of iron wire would it take to bind the three cylinders for a week?
张师傅用绳把3根直径均为10厘米的圆柱捆在一起(不计接头)，把3根圆柱捆一周要多少厘米铁丝？
<gadget id="calculator">3.14 * 10</gadget>
<output>31.4</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">31.4 + 40</gadget>
<output>71.4</output>

<result>71.4</result>