Respuesta :

serenavass

Answer:

b and 57 are adjacent and supplementary angles so

b+59=180

b=180-59=121

dinohoodie

Answer:

123

Step-by-step explanation:

since a straight line is 180° you need to do this:

180°-57°

which is equal to 123

therefore the measure of angle of b is 123°

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