Current location - Music Encyclopedia - Dating - (2004? Yueyang) As shown in the figure, in ⊙O, chord AB=43cm, radius r=4cm, then ∠BAO=______ degree
(2004? Yueyang) As shown in the figure, in ⊙O, chord AB=43cm, radius r=4cm, then ∠BAO=______ degree

Answer: Solution: Draw a perpendicular line from point O to AB, then the perpendicular line bisects AB to get 23.

The radius of ∵ is 4. According to the relationship between the sides and angles of the right triangle, we can know:

cos∠BAO=32,

∴∠BAO=30°.

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