Classification of the pyramids

  • Regular pyramid: It has a regular polygon as its base and its side faces are equal.

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  • Irregular pyramid: It has a base that is a convex polygon.

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  • Convex pyramid: Its base is a convex polygon.

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  • Concave pyramid: It has a base that is a concave polygon.

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  • Straight pyramid: all its side faces are isosceles triangles and the height falls down to the average point of the base.

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  • Oblique pyramid: It has one side face that is not an isosceles triangle.

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