The school wants to dig a rectangular sandpit with a length of 4 meters, a width of 2 meters and a depth of 0.5 meters. What is the volume of this rectangular sandpit in cubic meters?
学校要挖一个长方形状沙坑，长4米，宽2米，深0.5米，这个长方形沙坑的容积是多少立方米？
<gadget id="calculator">4 * 2 * 0.5</gadget>
<output>4</output>

<result>4</result>