millimeters are a use of measuring distance
the volume equivalent is Cubic Millimeters and 3/4 a U.S cup would be 177441.177
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The person posting the above answer must have misread the question. The question is regarding Millilitres, a perfectly standard volume measure.
There are precisely 177.44117775 ml in three quarters of a cup.
So we would of course round that up to 180.
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