Billiards players calculate bank shots, but this is not performed using simple angles. When a billiard ball strikes a rail cushion at an angle, the angular momentum is changed, in addition to angle of rebound. This rail induced english results in the bal coming off the rail at a greater angle than the angle it struck the rail cushion at. For extremely powerful shots, the cushion compression reduces the angle of deflection. These are calculated by an experienced player, a more complex calculation than simple angles.
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The only angles on a pool table are the corners and the pocket rail angles. All corners are at 90 degrees. The pocket angles can vary but can be determined by measuring or averaged by use of the pocket measurements allowed on a regulation table.