已知弧长3557mm高为1160mm弦长2300mm求弧形面积.公式也给我

Answer 1

已知弧长C=3557mm 高为H=1160mm 弦长L=2300mm 求弧形面积S?
弧半径为R,弧所对的圆心角为A.
Rn+1=(1+(L-2*Rn*SIN(C/(2*Rn)))/(L-C*COS(C/(2*Rn))))*Rn
R0=1200
R1=1145.248
R2=1150.302
R3=1150.352
R4=1150.352
R=1150.352
A=2*ARC COS((R-H)/R)
=2*ARC COS((1150.352-1160)/1150.352)
=180.96
S=PI*R^2-(PI*R^2*(360-A)/360)+L*(R*COS((360-A)/2))/2
=PI*1150.352^2-(PI*1150.352^2*(360-180.96)/360)+2300*(1150.352*COS((360-180.96)/2))/2
=2100818.8