An oblique pyramid is either one whose base is not a regular polygon or one whose apex is not vertically above the centre of its base.
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right pyramid oblique cone right cone oblique pyramid
If we're talking in purely geometric terms: If the edges of a prism/cylinder make a right angle with the base, it is called a right prism/cylinder. If not, it is an oblique prism/cylinder...it will look as if it were slanting to one side instead of standing straight. Similarly, if the top vertex of a pyramid/cone is directly above the center of the base, it is a right pyramid/cone. Otherwise, it is an oblique pyramid/cone. Again, it will look a bit askew.
characteristics are: The lateral faces are triangles. it is three-dimensional. The lateral faces are not congruent.
oblique rectangular
Slanting. A slash (/) is oblique