Zhejiang education printing plate eighth grade mathematics

Solution: Make the normals of point A and point B, and then the incident angle is equal to the reflection angle, and the parallel deflection angles of the two straight lines are equal.

∠ABC=2∠O, ∠PAB=4∠O, from which ∠CBO=2∠O, so 3∠O= right angle, so ∠O=30 degrees.

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