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The seventh grade people's education edition mathematics book volume 2 page 8 question 8 answer.
(1)∫OA bisector ∠COE (known),

∴∠ AOC = 1/2 ∠ COE = 35 (angle bisector definition)

∴∠BOD =∞∠AOC = 35° (equal to the vertex angle).

(2) 𕚸 EOC+∠ EOD =180 (adjacent complementary angle definition)

∠ EOC :∠ EOD = 2: 3 (known),

∴∠COE= 180 ÷(2+3)×2=72,

∴∠AOC= 1/2∠EOC=36,

∴∠BOD=∠AOC=36 .