A cylindrical tin bucket without a lid has a bottom diameter of 30 cm and a height of 60 cm. What is the area to be painted with anti-rust paint on the inner and outer walls of the bucket?
一个没有盖的圆柱形铁皮水桶的底面直径是30cm，高是60cm．要在水桶的内壁和外壁涂上防锈漆，涂的面积是多少？
<gadget id="calculator">3.14 * 30 * 60</gadget>
<output>5_652</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 ** 2</gadget>
<output>225</output>

<gadget id="calculator">3.14 * 225</gadget>
<output>706.5</output>

<gadget id="calculator">5_652 + 706.5</gadget>
<output>6_358.5</output>

<gadget id="calculator">6_358.5 * 2</gadget>
<output>12_717</output>

<result>12_717</result>