【#文档大全网# 导语】以下是®文档大全网的小编为您整理的《已知弧弦求半径计算》,欢迎阅读!
A:B: K=A÷B Q=1 Lbl 1
C=0.0174533RQ D=2RSin(Q÷2) L=C÷D
K Q=Q-0.1:Lbl 2
C=0.0174533RQ D=2RSin(Q÷2) L=C÷D
K Q=Q-0.1:Lbl 3
C=0.0174533RQ D=2RSin(Q÷2) L=C÷D
K>L=> Q=Q+0.01:Lbl 4
C=0.0174533RQ D=2RSin(Q÷2) L=C÷D
Goto2:Goto2:Goto3:≠>Q=Q+1:Goto1 ≠>Q=Q+0.01:Goto3 ≠> Q=Q-0.001:Goto4
K>L=> Q=Q-0.001:Goto4:≠> Goto5 Lbl 5
R=A÷0.0174533Q
已知弧长C=15,弦长L=14 求圆半径R!!!
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn R0=10 R1=11.214 R2=11.684 R3=11.737 R4=11.738 R5=11.738
圆半径R=11.738
弧长公式:
弧长L=2πr*n/360,(r=圆半径,n=弧长所对圆心角度数)
根据三角形三边得
sinn/2=7/r
消去n
180L/πr=n, sin(90L/πr)=7/r
sin(15/2r)=7/r<=1,设m=15/2r,r=15/2m
sinm=14m/15
余弦定理得;L^=2r^-2r^*cosn
222
225÷2r^=1-Cosn
cosn=1-225÷2r^2=cos15/2r
cosm=1-225/2(15/2m)^2=1-225*4m^2/(2*225)=1-2m^2
sin^2m+cos^2m=1
代入196m^2/225+(1-2m^2)^2=1
设m^2=t
196t/225+1-4t+t^2=1
t^2-704t/225=0
t=704/225,m=8√11/15
r=15/2m=15*15/16√11=2475√11/16
2
本文来源:https://www.wddqxz.cn/802fb82bb62acfc789eb172ded630b1c58ee9b42.html