A cuboid iron block with a length of 15.7 cm, a width of 12 cm, and a height of 5 cm is melted and cast into a cylindrical iron bar with a base radius of 2 cm. How many centimeters is this iron bar?
把一个长15.7厘米，宽12厘米，高5厘米的长方体铁块熔铸成一个底面半径是2厘米的圆柱体铁棍，这个铁棍长多少厘米？
<gadget id="calculator">15.7 * 12 * 5</gadget>
<output>942</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">942 / 12.56</gadget>
<output>75</output>

<result>75</result>