按你的答案，r=1/(1+tan(pi/3))=0.366...
should be R ( 1 + sec(theta/2)), if theta = 120deg, r = 0.464 R
谢谢。
对
布衣之才
2022-01-17 11:36:06should be R ( 1 + sec(theta/2)), if theta = 120deg, r = 0.464 R