If a conical log with a base radius of 4.5 decimeters and a height of 0.3 meters is cut vertically into two equal parts along the height, the surface area increases by how many square decimeters.
一个底面半径为4.5分米，高0.3米的圆锥形木头，沿高垂直截成同样的两部分，表面积增加了多少平方分米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">4.5 * 2 * 0.3 * 5 * 2</gadget>
<output>27</output>

<result>27</result>