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In class, Dr. Lavelle used the example of BF3 for a trigonal planar structure. For your case, let's say one of the F atoms is Cl. Since Cl is a bigger atom than F (thus more repulsion), it would cause the angle between the Cl and F atoms to become bigger. Knowing that the angle between atoms of a trigonal planar structure is 120˚, we can guess that the angle between Cl and F is >120˚, but we won't be able to guess the exact angle.
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