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Question
How many pairs of adjacent angles, in all, can you name in below fig.?
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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 pairs of adjacent angles
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