A cylinder is cut along the radius and height of the base, and assembled into an approximate cuboid with a height of 10 cm and a width of 4 cm. What is the volume of this cuboid?
一个圆柱体沿底面半径和高切开，拼成一个近似长方体，高是10厘米，宽是4厘米，这个长方体的体积是多少？
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 10</gadget>
<output>502.4</output>

<result>502.4</result>