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Exercitiu 16 va rooog!

Exercitiu 16 Va Rooog class=

Răspuns :

m(∡AOB)=x
m(∡AOD)=8x
m(∡BOD)=m(∡AOB)+m(∡AOD)=8x+x=9x
m(∡BOD)=180°
9x=180°
x=20°
m(∡AOB)=20°
m(∡AOD)=20°×8=160°
m(∡BOC)=90°-20°=70°
m(∡DOC)=180°-70°=110°