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llamamos a los 3 ángulosA; B ; C
A es la mitad de B y la tercera parte de C
A = X
B = 2X
C = 3X
A+B+C=180
X+2X+3X=180
6X=180
X=180/6
X=30
A=30
B= 2*30=60
C=3*30= 90