[Merged by Bors] - feat(geometry/euclidean/angle/oriented/basic): π / 2
rotations and inner product
#17687
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Add a series of lemmas relating to the inner product of a vector and a
π / 2
rotation of that vector being zero, with variants that are convenient forsimp
and aniff
lemma that the inner product is zero if and only if a vector is zero or one is a multiple of aπ / 2
rotation of the other.