If three cylinders with a radius of 1 decimeter are tied together, how many meters of iron wire are needed to go around them if the joints are not counted?
把半径为1分米的三个圆筒捆在一起，如果接头处不算，要多少米长的铁丝才能绕他们一圈？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3.14 * (1/10) * 2</gadget>
<output>0.628</output>

<gadget id="calculator">(1/10) * 3</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">0.628 + (3/10)</gadget>
<output>0.928</output>

<result>0.928</result>