Triangular Pyramid
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An icosahedron.
The tetrahedron has 4 equilateral triangles as its faces.
what is a shape with six congruent sides? Congruent = similar or fit together well My Answer: CUBE ..._ ./_/| |_|/ * * * * * Or a triangular dipyramid which is two regular tetrahedra (equilateral triangular pyramids) stuck together face-to-face.
It is an octahedron which is one of the Platonic Solids having 8 equilateral triangular faces and 12 edges.
A cube, rectangular prism, or pyramid.