Răspuns :
a, b, c - unghiuri
a+b+c=180
a=k
b=k+1
c=k+2
k+k+1+k+2=180
3k+3=180
3k=177
k=59
a=59
b=59+1=60 => unghi de 60 de grade
c=59+2=61
a+b+c=180
a=k
b=k+1
c=k+2
k+k+1+k+2=180
3k+3=180
3k=177
k=59
a=59
b=59+1=60 => unghi de 60 de grade
c=59+2=61