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6x+4x+3x/12= 180
13x/12= 180
13x= 180×12
13x= 2160
x= 2160/13
x= 166,15
Remplazamos en x
x/2 = 83,1
x/3= 55,4
x/4= 41,5
8,1+55,4+41,5= 180
R=
a= 83,1°
b= 55,4°
c= 41,5°