Cut a cylinder whose base circumference is 18.84 cm into two equal pieces along the base diameter, and the surface area increases by 84 square centimeters. What is the height of the cylinder in centimeters?
把一个底面周长是18.84厘米的圆柱沿底面直径切成相同的两块，表面积增加84平方厘米，这个圆柱的高是多少厘米．
<gadget id="calculator">18.84 / 3.14</gadget>
<output>6</output>

<gadget id="calculator">84 / 2 / 6</gadget>
<output>7</output>

<result>7</result>