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Q: Name a 3d shape that has 4 congruent equilateral faces?

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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

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This shape is called a Icosahedron , I think.

An icosahedron is a regular polyhedron with 20 equilateral triangle faces.

Equilateral triangle

The answer is : equilateral triangle

An equilateral triangle.

Equilateral.

There are a few families of polyhedra with identical faces. There are none whose faces have 6 or more sides. There is no special name for polyhedra whose faces are pentagons or pentagrams. A dodecahedron is an example. If coplanar faces are disallowed, the only polyhedron with quadrilateral faces are the cube and rhombohedron. There are infinitely many polyhedra with equilateral triangular faces: the tetrahedron, octahedron and icosahedron are examples.

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.

It is a triangle.

An equilateral triangle.

There are two types of quadrilaterals that are formed when two congruent equilateral triangles are joined. These shapes are rhombus and parallelogram.

an equilateral triangle

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