If a cylindrical piece of wood with a base diameter of 4 meters and a height of 4 meters is split in half along the diameter, the surface area will increase by how many square meters.
把一根底面直径4米，高4米的圆柱形木材，沿着直径劈成两半，表面积增加了多少平方米．
<gadget id="calculator">4 * 4 * 2</gadget>
<output>32</output>

<result>32</result>