∴∠ 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 .