Q: What 3d shape has 20 congruent equilateral triangles as faces?

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Regular polygons have congruent angles such as squares and equilateral triangles.

A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.

Triangular Pyramid

The Platonic solid known as an octahedron would fit the given description

The tetrahedron has 4 equilateral triangles as its faces.

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An Icosahedron.

This shape is called a Icosahedron , I think.

Regular polygons have congruent angles such as squares and equilateral triangles.

A tetrahedron has four equilateral triangles as sides

A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.

Triangular Pyramid

Differences: Squares have 4 sides / equilateral triangles have 3 sides. Squares have 90 degree angles / equilateral triangles have 60 degree angles. Squares have 2 diagonals / equilateral triangles have none Similarities: All sides of the shape are congruent All angles of the shape are congruent

The Platonic solid known as an octahedron would fit the given description

The tetrahedron has 4 equilateral triangles as its faces.

square based pyramid

An octahedron.

A hexagon based pyramid.