1)弓弦长L=46m弓的高度h=5.095m半径R弧长l
R² =(L/2)² +(R-h)² =L² /4+R² -2Rh+h²
2Rh=L² /4+h²
2R=L² /4h+h=46²/4*5.095+5.095=2700.35m
2) Sina=(L/2)/R= L/2R=46/2700.35=0.017035
a=ArcSin0.017035=0.98
n=2a=1.96度
3) l=2π R n/360°=3.14*2R*1.96/360=46.164m
1)弓弦长L=46m弓的高度h=5.095m半径R弧长l
R² =(L/2)² +(R-h)² =L² /4+R² -2Rh+h²
2Rh=L² /4+h²
2R=L² /4h+h=46²/4*5.095+5.095=2700.35m
2) Sina=(L/2)/R= L/2R=46/2700.35=0.017035
a=ArcSin0.017035=0.98
n=2a=1.96度
3) l=2π R n/360°=3.14*2R*1.96/360=46.164m