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The answer on page 25 of the second volume of mathematics classroom exercise book in grade five.
2. The adjacent complementary angles of (1) ∠ AOC are ∠COB, ∠AOD.

The adjacent complementary angles of ∠BOE are ∠BOF and ∠AOE.

(2) DOA is ∠COB.

∠EOC has an antipodal angle of∠ ∠FOD.

(3) ∠ BOD = ∠ AOC = 50 (vertex angles are equal)

∠ Cob = 180 —∠ AOC =130 (the sum of adjacent complementary angles is180).