Question:
How many pairs of adjacent angles, in all, can you name in the figure below?
Solution:
Pairs of adjacent angles are:
∠EOC, ∠DOC
∠EOD, ∠DOB
∠DOC, ∠COB
∠EOD, ∠DOA
∠DOC, ∠COA
∠BOC, ∠BOA
∠BOA, ∠BOD
∠BOA, ∠BOE
∠EOC, ∠COA
∠EOC, ∠COB
Hence, 10 pair of adjacent angles.
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