In a square wooden block with a base area of 324 square centimeters, dig out a cylinder with the largest volume, and then paint the remaining surface, what is the painted area?
在一个底面积为324平方厘米的正方形木块中，挖去一个最大体积的圆柱，然后在剩下的表面涂上油漆，求涂油漆的面积是多少？
<gadget id="calculator">18 * 18 * 6</gadget>
<output>1_944</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 ** 2</gadget>
<output>81</output>

<gadget id="calculator">3.14 * 81 * 2</gadget>
<output>508.68</output>

<gadget id="calculator">1_944 - 508.68</gadget>
<output>1_435.32</output>

<gadget id="calculator">3.14 * 18 * 18</gadget>
<output>1_017.36</output>

<gadget id="calculator">1_435.32 + 1_017.36</gadget>
<output>2_452.68</output>

<result>2_452.68</result>