There is a steel wire that can be wound 10 times around a round iron pipe with a diameter of 15 cm. How long is this steel wire in meters?
有一根钢丝，在一个直径是15厘米的圆铁管上能绕10圈，这根钢丝长多少米．
<gadget id="calculator">3.14 * 15 * 10</gadget>
<output>471</output>

<gadget id="calculator">471 / 100</gadget>
<output>471/100 = around 4.71</output>

<result>471/100 = around 4.71</result>