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Dau 5.0 stele
doar 1,2,3,4.​


Dau 50 Steledoar 1234 class=

Răspuns :

Răspuns:

1.m(AOB)=m(DOC)=35°

m(AOD)=m(BOC)=180°-35°=145°

2.m(AOD)=m(BOC)=100°

m(AOB)=m(DOC)=180°-100°=80°

3.m(BOC)+m(COD)=180 =>

=>2x+x=180 =>3x=180 =>x=60°

x=m(DOC)=m(AOB)=60°

2x=m(AOD)=m(BOC)=120°

4.m(AOD)+m(DOC)=180° =>

=>3x+20+x=180° =>4x=180°-20 =>

=>4x=160° =>x= 40°

x=m(DOC)=m(AOB)=40°

3x+20=m(AOD)=m(BOC)=120°+20=140°