A cuboid steel block with a length of 5 decimeters, a width of 3.14 decimeters and a height of 4 decimeters is melted and cast into two cylinders with equal bases and a height of 4 decimeters. What is the area of the bottom of each cylinder?
把一个长5分米、宽3.14分米、高4分米的长方体钢块熔铸成两个等底且高都为4分米的圆柱，每个圆柱的底面积是多少？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 * 3.14 * (1/2)</gadget>
<output>7.85</output>

<result>7.85</result>