In the 200-meter sprint final of the Autumn Games, shots were fired immediately. Lingling was surprised to find that the starting lines of the eight runners were different. It is known that the radius of the innermost curve is 31.7 meters, each track is about 1.2 meters wide, and the curve part is a semicircle. In order to be fair, how many meters should be the difference between the starting lines on two adjacent runways?
秋季运动会200米短跑决赛马上鸣枪，玲玲奇怪的发现8名选手的起跑线不一样，已知最内圈的弯道半径是31.7米，每道赛道宽约1.2米，弯道部分为半圆．为了公平，相邻的两条跑道上起跑线应相差多少米？
<gadget id="calculator">3.14 * 1.2</gadget>
<output>3.768</output>

<result>3.768</result>