(1700/2)²=h*(2r-h)2r-530=850²/530=1363r=(1363+530)/2=1893/2=947sin(A/2)=850/947=0.89757A/2=63.8°A=127°L=2*3.14*947*127/360=2098mm弧线长2098mm
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aron
赞同来自 :
(1700/2)²=h*(2r-h)
2r-530=850²/530=1363
r=(1363+530)/2=1893/2=947
sin(A/2)=850/947=0.89757
A/2=63.8°
A=127°
L=2*3.14*947*127/360
=2098mm
弧线长2098mm