Răspuns :
<AOB si <BOC adiacente suplementare⇒<AOB+<BOC=180°
25+2x+45+3x=180
2x+3x=180-70=90
5x=90
x=18
m<BOC=45+3x
=45+3*18
=45+54
=99°
25+2x+45+3x=180
2x+3x=180-70=90
5x=90
x=18
m<BOC=45+3x
=45+3*18
=45+54
=99°