Gợi ý làm bài
(h.63)
Sđ cung \(AB = {\pi \over 3} + k2\pi ,k \in Z\)
Sđ cung \(AC = {{2\pi } \over 3} + k2\pi ,k \in Z\)
Sđ cung \(A{\rm{D}} = \pi + k2\pi ,k \in Z\)
Sđ cung \(A{\rm{E}} = {{4\pi } \over 3} + k2\pi ,k \in Z\)
Sđ cung \(AF = {{5\pi } \over 3} + k2\pi ,k \in Z\)