There are 50 cuboid logs whose cross-section is a square with a circumference of 12 cm, and each log is 4 meters long. How many cubic meters are there in total?
有50根长方体的木料，横截面是周长12厘米的正方形，每根木料长4米，这些木料共有多少立方米？
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">12 / 4 / 10_000</gadget>
<output>3/10_000 = around 0.0003</output>

<gadget id="calculator">3 * (3/10_000) * 4 * 50</gadget>
<output>9/50 = around 0.18</output>

<result>9/50 = around 0.18</result>