(Polar molecules, Non-polar molecules, etc.)
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We are supposed to know the angles based on a rough guideline for each shape, but for certain cases, such as molecules with lone pair electrons, we are to estimate if the bond angle is greater than or less than the "standard" angle for the shape.
Reiterating an above response, for many of the shapes, lone electron pairs causes angles to decrease. In that instance, you only need to know that the angle is less than an established value. For example, for trigonal pyramidal, you just need to know that the angle is less than 109.5 degrees. You wouldn't have to know that it is actually 106 degrees.
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