Since there is no figure provided, I will assume a simple intersecting lines figure.
Consider two intersecting lines, forming four angles: ∠1, ∠2, ∠3, and ∠4. We can assume that ∠1 and ∠2 are adjacent, as well as ∠2 and ∠3, ∠3 and ∠4, and ∠4 and ∠1.
(a) Linear
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