cylinder with a height of 8 cm and a circumference of the base of 25.12 cm is now cut vertically along its diameter. How many square centimeters does the surface area increase?
一个圆柱高8cm，底面周长25.12cm，现在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>