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the square of the distance apart will be reduced by 2
the square of the distance apart will be reduced by 2Another way of saying this is that the distance must be reduced by the square root of 2, which is approximately 1.414.50mm divided by 1.414 is roughly 35mm.This is the answer in words. If this is a homework assignment, you will need to work out the answer as an equation, and provide it to more decimal places...
You are right that the square of the distance must be halved.