A cylinder and a cone have the same base and height, and their volumes differ by 47.1 cubic centimeters. If the radius of the base of a cylinder is 3 cm, what is the lateral area of the cylinder in square centimeters?
一个圆柱体和一个圆锥体等底等高，它们的体积相差47.1立方厘米．如果圆柱体的底面半径是3厘米，这个圆柱体的侧面积是多少平方厘米？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">47.1 / 2</gadget>
<output>23.55</output>

<gadget id="calculator">23.55 * 3</gadget>
<output>70.65</output>

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

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">70.65 / 28.26</gadget>
<output>2.5</output>

<gadget id="calculator">3.14 * 3 * 2 * 2.5</gadget>
<output>47.1</output>

<result>47.1</result>