A cylinder whose base radius is equal to its height has a surface area of 1256 square centimeters, if it is cut in half along its diameter, how many square decimeters will the surface area increase?
一个圆柱的底面半径与高相等，表面积是1256平方厘米，如果沿着它的直径切开两半，则表面积增加多少平方分米．
<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">10 * 2 * 10 * (1/50)</gadget>
<output>4</output>

<result>4</result>