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What is the shape of a tetrahedral element’s face?

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What is the shape of a tetrahedral element’s face?

(a) Cuboid

(b) Cube

(c) Triangle

(d) Quadrilateral

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I want to ask this question from Types of FVM Elements in portion Finite Volume Methods of Computational Fluid Dynamics

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Right answer is (c) Triangle

Easy explanation: A tetrahedron has four triangular faces. Each face is formed by connecting three vertices of the tetrahedron. This is one of the most common shapes of element used in unstructured grids.

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