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what two things can you measure, what tool, and what unit
line, ruler, metric-standard / angle, protractor, degrees
proportions are used to solve a degree problum; PROPORTION
to ration/fractions set rquall to each other where the product of the means equalls the product of extreams
the two (segments / angles / triangles) are congruent if they have the same measure ( length / degree )
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