cylinder is 3 meters high and its surface area is 12.56 square meters more than its lateral area. What is the volume of this cylinder in cubic meters?
一个圆柱高3米，它的表面积比侧面积多12.56平方米，这个圆柱的体积是多少立方米．
<gadget id="calculator">12.56 / 2</gadget>
<output>6.28</output>

<gadget id="calculator">6.28 * 3</gadget>
<output>18.84</output>

<result>18.84</result>