A piece of wood with a length of 1 meter and a cross-sectional diameter of 20 centimeters floats on the water. Xiao Ming finds that half of it is above the water. What is the volume of the wood?
一根长1米，横截面直径是20厘米的木头浮在水面上，小明发现他正好是一半露出水面这个木头的体积是多少？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 2</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) ** 2</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">3.14 * (1/100) * 1</gadget>
<output>0.0314</output>

<result>0.0314</result>