If the surface of a cylinder with a base radius of 3 decimeters and a height of 10 decimeters is painted, what is the area of the painted part?
把底面半径为3分米，高是10分米的圆柱体的表面涂上油漆，那么油漆部分的面积有多少？
<gadget id="calculator">2 * 3.14 * 3 * 10</gadget>
<output>188.4</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 2</gadget>
<output>56.52</output>

<gadget id="calculator">188.4 + 56.52</gadget>
<output>244.92</output>

<result>244.92</result>