A steel pipe with a length of 120 meters, an outer diameter of 10 cm, and an inner diameter of 8 cm is painted on the inner and outer surfaces of the steel pipe. What is the painted area in square centimeters?
一根钢管，长120米，外直径10厘米，内直径8厘米，在钢管内外表面涂漆，涂漆的面积是多少平方厘米？
<gadget id="calculator">120 * 100</gadget>
<output>12_000</output>

<gadget id="calculator">3.14 * 10 * 12_000</gadget>
<output>376_800</output>

<gadget id="calculator">3.14 * 8 * 12_000</gadget>
<output>301_440</output>

<gadget id="calculator">376_800 + 301_440</gadget>
<output>678_240</output>

<result>678_240</result>