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

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A three-dimensional figure or shape, such as a tetrahedron, has four faces. These faces are equilateral triangles. A tetrahedron also has four vertices and 6 edges.

A square and rectangle both have congruent triangles in them.

congruent triangles

no. congruent means the same size and shape. all triangles don't share the same size and shape.

If you have 2 EQUILATERAL triangles, and you stack them on their respective hypotenuses, the result: SQUARE. If you have 2 ISOSCELES triangles, and you stack them on their respective hypotenuses, the result: RECTANGLE. If you have 2 OBTUSE triangles, and you stack them on their respective hypotenuses, the result: PARALLELOGRAM.

Related questions

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 tetrahedron has 4 equilateral triangles as its faces.

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

square based pyramid

An octahedron.

A hexagon based pyramid.

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