How many pair of vertically opposite angles are formed?

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Solution

There are two pairs of vertically opposite angle in the provided diagram as:
$∠ A C Y = ∠ X C B, ∠ A C X = ∠ B C Y$

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How many pair of vertically opposite angles are formed?

There are two pairs of vertically opposite angle in the provided diagram as:∠ACY=∠XCB,∠ACX=∠BCY

There are two pairs of vertically opposite angle in the provided diagram as:
$∠ A C Y = ∠ X C B, ∠ A C X = ∠ B C Y$