If the height of a cylinder is increased by 3 centimeters, the height of the obtained cylinder is equal to the circumference of the bottom surface, and the surface area is increased by 94.2 square centimeters. Find the volume of the original cylinder.
一个圆柱体，如果高增加了3厘米，所得的圆柱体高就与底面周长相等，且表面积增加了94.2平方厘米，求原来圆柱的体积多少．
<gadget id="calculator">94.2 / 3</gadget>
<output>31.4</output>

<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">31.4 - 3</gadget>
<output>28.4</output>

<gadget id="calculator">3.14 * 25 * 28.4</gadget>
<output>2_229.4</output>

<result>2_229.4</result>