[Merged by Bors] - feat(geometry/euclidean/angle/unoriented/affine): collinearity lemma #17634
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Add an `iff` condition for collinearity of three points in terms of the unoriented angle between them.
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…17634) Add an `iff` condition for collinearity of three points in terms of the unoriented angle between them.
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Add an
iffcondition for collinearity of three points in terms of the unoriented angle between them.