There can be no equivalence or conversion.
A degree is a measure of angular separation while a millimetre is a measure of linear separation or distance. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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1000*sin(3 deg) = 52.3 mm.
Using the cosine rule diagonal BD is 6.08 mm which splits angle 95 degrees into angles of 34.5 degrees and 60.5 degrees and so the area of the quadrilateral is:- 0.5*6.08*3.4*sin(34.5) plus 0.5*6.08*4.3*sin(60.5) = 17.232 square mm
3,000 mm
180 mm