The radius of the base of a cylinder is 2cm, its surface area is known to be 628cm**2, what is its volume?
一个圆柱的底面半径是2cm，已知它的表面积是628cm**2，那么它的体积是多少．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">628 - 25.12</gadget>
<output>602.88</output>

<gadget id="calculator">2 * 3.14 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">602.88 / 12.56</gadget>
<output>48</output>

<gadget id="calculator">3.14 * 4 * 48</gadget>
<output>602.88</output>

<result>602.88</result>