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m(<A)=90°
m(<A)+m(<B)+m(<C)=180°
90°+(3x+6)+(x+4)=180°
90+3x+6+x+4=180
100+4x=180
4x=180-100
4x=80
x=80:4
x=20°
m(<B)=x+4=
=20+4=
=24°
m(<C)=3x+6=
=3×20+6=
=60+6=
=66°