The diameter of the base of a cylinder is 2 decimeters, and the surface area is 12.56 square decimeters. What is the height of the cylinder in decimeters?
一个圆柱的底面直径是2分米，表面积是12.56平方分米，这个圆柱的高是多少分米．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 - 6.28</gadget>
<output>6.28</output>

<gadget id="calculator">2 * 3.14 * 1</gadget>
<output>6.28</output>

<gadget id="calculator">6.28 / 6.28</gadget>
<output>1</output>

<result>1</result>