m(∡aob)=2×m(∡boc)
m(∡aob)=m(∡aoc)-40°⇒m(∡aoc)=m(∡aob)+40°
⇒m(∡aoc)=2×m(∡boc)+40°
m(∡aob)+m(∡boc)+m(∡aoc)=360°
2×m(∡boc)+m(∡boc)+2×m(boc)+40°=360°
5×m(∡boc)=360°-40°=320°
m(∡boc)=320°÷5
m(∡boc)=64°
m(∡aob)=2×64°
m(∡aob)=128°
m(∡aoc)=128°+40°
m(∡aoc)=168°
scuze ca a durat asa mult. succes!