A circular wooden barrel has an outer diameter of 0.6 meters. Now it is necessary to add an iron hoop to the outside of it. The length of the joint of the iron hoop is 0.03 meters. Find the length of the iron hoop.
一个圆形木桶，外直径是0.6米，现要在它的外面加一道铁箍，铁箍接头处长0.03米，求铁箍的长．
<gadget id="calculator">3.14 * 0.6</gadget>
<output>1.884</output>

<gadget id="calculator">1.884 + 0.03</gadget>
<output>1.914</output>

<result>1.914</result>