弦高13.17cm外孤长4.39m,求内弦长
作者&投稿：巢符 （若有异议请与网页底部的电邮联系）
知道弦长弦高求孤长的公式是什么？？？？~
弧半径为R，弧所对的圆心角为A。
H=13.17cm=0.1317m
Rn+1=(1-(Rn*COS(C/(2*Rn))-Rn+H)/((C/2)*SIN(C/(2*Rn))-H))*Rn
R0=18
R1=18.2618
R2=18.2697
R3=18.2697
R=18.2697m
A=C/R=4.39/18.2697=0.2402886弧度=0.2402886*180/π=13.7675度
L=2*R*SIN(A/2)
=2*18.2697*SIN(13.7675/2)
=4.3794m
知道弦长L，弦高H，求孤长C的公式是什么？
弧半径为R，弧所对的圆心角为A。
R=H/2+L^2/(8*H)
A=2*ARC COS((R-H)/R)
C=π*R*A/180
有半经R=4212弦长L=2509求孤长C?
弧所对的圆心角为A。
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((2509/2)/4212)
=34.656度
C=π*R*A/180=π*4212*34.656/180=2547.659
弧半径为R，弧所对的圆心角为A。
H=13.17cm=0.1317m
Rn+1=(1-(Rn*COS(C/(2*Rn))-Rn+H)/((C/2)*SIN(C/(2*Rn))-H))*Rn
R0=18
R1=18.2618
R2=18.2697
R3=18.2697
R=18.2697m
A=C/R=4.39/18.2697=0.2402886弧度=0.2402886*180/π=13.7675度
L=2*R*SIN(A/2)
=2*18.2697*SIN(13.7675/2)
=4.3794m
弦高13.17cm外孤长4.39m,求内弦长
答：弦高H=13.17cm外孤长C=4.39m,求内弦长L？弧半径为R，弧所对的圆心角为A。H=13.17cm=0.1317m Rn+1=(1-(Rn*COS(C/(2*Rn))-Rn+H)/((C/2)*SIN(C/(2*Rn))-H))*Rn R0=18 R1=18.2618 R2=18.2697 R3=18.2697 R=18.2697m A=C/R=4.39/18.2697=0.2402886弧度=0.2...
弦高13.17cm外孤长4.39m,求内弦长
答：弦高＝r-rcos(θ/2)13.17=r(1-cos(219.5/r))
弦高800,弦长6OO0,孤长是多少?
答：弧长=6280.517641
