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Related articles:
Parallel (geometry)
Orthogonality
Surface normal
Cartesian coordinate system
Angle
Key terms: line math ab if angles cd perpendicular any slope form point parallel geometry figure solve congruent find step congruence construct equal plane line ab vertical symbol triangles two lines compass each other adjacent equation straight right angles third line transversal line segment through the point perpendicular to line Search external links cited by footnotes on Wikipedia page Perpendicular: |
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