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Something that is oblique is slanted or not perpendicular. Oblique coordinates are measured on a plane coordinate system whose axes are not perpendicular. An oblique angle is any angle except a right angle and an oblique triangle is any triangle that doesn't contain a right angle (i.e., one in which one of the interior angles is obtuse). The first reference to "oblique angled triangles" may have been by Thomas Blundevil in his Exercises in 1594.

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