The height of a cylinder is 8 cm, and the circumference of the base is 25.12 cm. If it is cut vertically along its diameter, how many square centimeters will the surface area increase?
一个圆柱的高是8厘米，底面周长是25.12厘米，如果沿着它的直径垂直切开，表面积增加了多少平方厘米．
<gadget id="calculator">25.12 / 3.14</gadget>
<output>8</output>

<gadget id="calculator">8 * 8 * 2</gadget>
<output>128</output>

<result>128</result>