log with a base diameter of 30 cm and a length of 2 meters is processed into the largest cuboid log. What is the maximum volume of the log in cubic meters?
将一根底面直径是30厘米，长2米的圆木，加工成最大的长方体方木，这根方木的最大体积是多少立方米．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) / 2</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) ** 2</gadget>
<output>9/400 = around 0.0225</output>

<gadget id="calculator">2 * (9/400) * 2</gadget>
<output>9/100 = around 0.09</output>

<result>9/100 = around 0.09</result>