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perpendicular to, perpendicular with

Objects at a 90° angle are perpendicular to one another. Perpendicular with is non-standard.

  • The leaning Tower of Pisa is famous for not being perpendicular to the ground.
  • Yonge Street runs perpendicular to the shore of Lake Ontario.

In formal writing, do not qualify perpendicular to, as in roughly perpendicular to and similar expressions.

  • Thames St. and Waverly Ave. are perpendicular (not roughly perpendicular) to each other.