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 Description  
 Oblique:  A three dimensional figure that appears slanted. Also, a triangle that is not a right triangle (i.e., acute or obtuse).

 

The figure at the right shows an oblique cylinder. The bases are parallel but the segments connecting corresponding points are not perpendicular to the bases. In other words, they do not form a right angle with either base, making the cylinder appear slanted.

 

 

 

The figure at the left shows an oblique cone. The line segments connecting the apex to the base do not form a right angle with the base, making the cone appear slanted.