You cannot convert even numbers to triangular numbers! There is no such relationship.
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Triangular number: An integer of the form (1/2)n(n + 1), where n is a positive integer.12 is not a triangular number. The first few triangular numbers are 1, 3, 6, 10, and 15.
Triangular prism
The boat had triangular sails.
The boat was small and had two triangular sails.
Triangular prism * * * * * No. It is a triangular pyramid or a tetrahedron. A triangular prism has 6 vertices and 5 faces.