弦长72m,半径134米 弧长是多少?速求!
问题描述:
弦长72m,半径134米 弧长是多少?速求!
答
sin(A/2)=36/134A/2=arc sin 36/134=15.584349282292838999067965031701.°A=31.168698564585677998135930063402.°C=2*134*π=841.94683116206458790798842671891.m弧长=C*A/360=72.895519410829174186152384798706...