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How to write the seventh question on the fifth page of all textbooks in the second volume of the second grade of primary school?
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).