发布时间:2025-01-23 20:27:09
这不很简单,半圆式田径场的两个弯道长度之和,正好等于一个圆的圆周。跑道总长为200米,而直道是50米,那么两边直道总长为50*2=100米,所以两个半圆总长是100米。那么内突沿半径为
C=2∏(圆周率)r, 100=2*3.1415926*r,解得r=15.92米。
btp2200e472300e 条码47标签打印机怎么做价签
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