The wood used to make furniture is a cylindrical wood with a diameter of 40 cm and a length of 3 meters. About 5 woods are needed. How many cubic meters are these woods in total?
做家具时所选用的木料是直径40厘米，长是3米的圆柱形木料，大约需要5根，这些木料的体积共多少立方米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 2</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) ** 2</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">3.14 * (1/25) * 3 * 5</gadget>
<output>1.884</output>

<result>1.884</result>