C=rθ L=2rsinθ
sinθ/θ=L/2C=1023/(2*1150)= 0.444783
求得θ≈ 2.02265
r=C/θ≈1150/2.02265≈568.6怎么验算了一下不太对是算错了，应是L=2rsin(θ/2)
C=rθ=2rθ/2 L=2rsin(θ/2)
sin(θ/2)/(θ/2)=L/C=1023/1150=0.889565217
求得θ/2≈ 0.8281
r=C/θ≈1150/(0.8281*2)≈694.36