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oblique
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. The first reference to "oblique angled triangles" may have been by Thomas Blundevil in his Exercises in 1594.
Related category
• GEOMETRY
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