Răspuns :
a=primul unghi
b=al doilea unghi
a+b=180
a-b=70⇒a=70+b
70+b+b=180
70+2b=180
2b=180-70=110
b=110:2=55
a=70+55=125
b=al doilea unghi
a+b=180
a-b=70⇒a=70+b
70+b+b=180
70+2b=180
2b=180-70=110
b=110:2=55
a=70+55=125