charlesbrame3 charlesbrame3

05-11-2018
Mathematics

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In ABC, if mA = 81° and mC = 27°, then find m

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trevordoyleione trevordoyleione

05-11-2018

If ABC is a Triangle which it likely is because it has ABC naming 3 vertices

mA = 81° and mC = 27° and MB is unknown

all triangles add to 180 degrees

so 180 - (81 + 27) = mB

180 - 108 = mB

72 = mB

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