Put together a cylinder with a height of 15cm into an approximate cuboid. The surface area of this cuboid is 90cm**2 larger than that of the original cylinder. What is the volume of the original cylinder?
把一个高为15cm圆柱拼成一个近似长方体，这个长方体的表面积比原来圆柱的表面积多90cm**2，原来圆柱的体积是多少．
<gadget id="calculator">90 / 2 / 15</gadget>
<output>3</output>

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

<gadget id="calculator">3.14 * 9 * 15</gadget>
<output>423.9</output>

<result>423.9</result>