Răspuns:
ACE = BCD = 130°
ABC = DCE = 60
(ACB + BCD = 180°)
ABE = CBD = 39°
ABC = DBE = 180°-39° = 141°
a)∠BCD=130° ∠ACB=? ∠ACD=180°
1)180°-130°=(∠ACB=50°)
∠BCD=130°≡∠ACE=130°
∠ACB=50°≡∠ECD=50°
b)∠CBD=39° ∠ABC=? ∠ABD=180°
1)180°-39°=(∠ABC=141°)
∠ABC=141°≡∠EBD=141°
∠CBD=39°≡∠ABE=39°
Sper te-am ajutat
