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A triangular pyramid is apyramid whose base is a triangle.
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.
pyramid
A pyramid is a generic term and can have any number (>3) of plane faces. A triangular pyramid has 4 faces, a rectangular one has 5, and so on. A pyramid whose base has n sides has n+1 faces.
It is a regular triangle pyramids