A cube, rectangular prism, or pyramid.
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An icosahedron is a regular polyhedron with 20 equilateral triangle faces.
Equilateral triangle
In geometry, a deltahedron (plural deltahedra) is a polyhedron whose faces are all equilateral triangles. The name is taken from the Greek upper case delta (Δ), which has the shape of an equilateral triangle.
A tetrahedron
an equiangular triangle meaning all the angles are equal or congruent measures