Use a thin iron wire to bind two logs with a diameter of 30 cm, at least how many centimeters of thin iron wire should be used (not counting the joints)
用一根细铁丝捆住两根直径为30厘米的圆木，至少要用多少厘米的细铁丝(接头不计)
<gadget id="calculator">3.14 * 30</gadget>
<output>94.2</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">94.2 + 60</gadget>
<output>154.2</output>

<result>154.2</result>