(Polar molecules, Non-polar molecules, etc.)
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Drawing out the example can be an indication of what the bond angle may entail, but it's best to just memorize the bond angles for each VSEPR arrangement. In addition to this, you can visualize the model in your head and think of all the different angles. However, I don't believe there is a way to specifically calculate each unique bond angle (especially ones with lone pair electrons pushing down) without some serious equipment.
We haven't been given a way to actually calculate the bond angles. However, it's easier to remember the angles if you remember the bond angles associated with each number of electron densities. For example, when there are two areas of electron density the angle will always be 180 degrees, when there are three the angle will be less than or equal to 120 degrees, when there are three regions the angles will be less than or equal to 109.5 degrees, and so on. This way you don't have to remember every single VSEPR model, you can just figure it out based on the number of regions of electron density.
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