cone-shaped sand pile has a bottom radius of 1 meter and a height of 4.5 decimeters. If this pile of sand is used to pave a road with a width of 5 meters to a thickness of 2 cm, how many meters can it be paved?
一个圆锥形沙堆底面半径是1米，高4.5分米，用这堆沙在5米宽的公路上铺2cm厚，可以铺几米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">4.5 / 10</gadget>
<output>0.45</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">5 * (1/50)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">0.45 / (1/10)</gadget>
<output>4.5</output>

<gadget id="calculator">(1/3) * 3.14 * 1 * 4.5</gadget>
<output>4.71</output>

<result>4.71</result>