Honestly, I had to look it up to see if you could even compare them using the term "Geometric Isomer." I have never used it for comparison of two molecules, but they are definitely diastereomers.
I also had to look it up. It looks like geometric isomers are a result of restricted rotation in a molecule, which can result from a double-bond or a cyclic compound. Also, it looks like the term 'geometric isomer' is out dated and has been replaced by cis/trans isomers.
The methyl groups in each molecule are trans, but the Bromine atoms are cis. Due to this ambiguity maybe diastereomers is a better classification than cis/trans isomers.
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