Cut a cylindrical wood with a base diameter of 0.6 meters and a length of 3 meters into 4 sections (each section is still cylindrical), the surface area is increased by how many square meters compared with the original wood.
把一根底面直径为0.6米、长3米的圆柱形木头截成4段(每段仍是圆柱形)，表面积比原木料增加了多少平方米．
<gadget id="calculator">0.6 / 2</gadget>
<output>0.3</output>

<gadget id="calculator">0.3 ** 2</gadget>
<output>0.09</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3.14 * 0.09 * 3 * 2</gadget>
<output>1.6956</output>

<result>1.6956</result>