∴∠ABO=∠OBC
∫CE sharing∠ ∠ACB
∴∠ACO=∠OCB
∫ Germany∨ BC
∴∠BOD=∠OBC ∠EOC=∠OEB (two parallel lines have the same internal angle)
∠∠ ABO =∠OBC∠ ACO =∠OCB.
∴∠ABO=∠DOB ∠EOC=∠ACO (equivalent substitution)
That is, △DBO and △ECO are isosceles triangles.
∴ DB = DOEC = Council of Europe
∫BD+EC = 5
∴BD+EC=DO+OE=5
Certificate of completion