A plastic ventilation pipe is 5 meters long and has a bottom radius of 3 decimeters. How many square meters of plastic are needed to make 16 such ventilation pipes?
一种塑料通风管长5米，底面半径3分米，做这样的16根通风管，至少需多少平方米的塑料？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3.14 * (3/10) * 2 * 5 * 16</gadget>
<output>150.72</output>

<result>150.72</result>