Two logs have a radius of 10 cm, and the two logs are tied together with a wire, and the joint is connected with a wire of 4 cm. How long is this wire in centimeters?
在两根圆木，半径都是10厘米，把两根圆木用铁丝捆在一起，接头处用铁丝4厘米．这根铁丝长多少厘米．
<gadget id="calculator">2 * 3.14 * 10</gadget>
<output>62.8</output>

<gadget id="calculator">10 * 2 * 2</gadget>
<output>40</output>

<gadget id="calculator">62.8 + 40 + 4</gadget>
<output>106.8</output>

<result>106.8</result>