cylinder of wood is 4 meters long and has a base radius of 10 cm. Cut it into 3 paragraphs. How many square centimeters has the surface area increased?
一根圆柱形木头长4米，底面半径是10厘米．把它截成3段后．表面积增加了多少平方厘米．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 4</gadget>
<output>1_256</output>

<result>1_256</result>