Use iron sheets to make a cylindrical ventilation pipe (hollow) with a diameter of 60cm and a height of 3m, and the joint of the iron sheet is 3cm. How many square meters of iron sheet is needed to make this ventilation pipe?
用铁皮做一根直径是60cm，高3m的圆柱形通风管(中空)、铁皮接口处为3cm，做这根通风管至少需要铁皮多少平方米？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3.14 * (3/5)</gadget>
<output>1.884</output>

<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">1.884 + (3/100)</gadget>
<output>1.914</output>

<gadget id="calculator">1.914 * 3</gadget>
<output>5.742</output>

<result>5.742</result>