A cylindrical wood with a length of 2 meters and a base radius of 0.5 meters is sawn into two pieces. How many square meters is the surface area of these woods increased compared with the original wood?
把一根长2米，底面半径是0.5米的圆柱形木料锯成两段，这些木料表面积比原木料增加了多少平方米．
<gadget id="calculator">0.5 ** 2</gadget>
<output>0.25</output>

<gadget id="calculator">3.14 * 0.25 * 2</gadget>
<output>1.57</output>

<result>1.57</result>