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Drivers of semitrucks and other large vehicles pay close attention to signs similar to the one below. These signs indicate a change in the grade or slope of the road. Look at the black scalene triangle in the sign. How can the third-angle theorem be applied to find all three angle measurements in the black triangle? (2 points)

Respuesta :

Answer:

Maybe a picture??

Answer:

A triangles angles equal 180 so add 90 and 60 then subtract that from 180. 2) yes. they have same angles so they must be congruent