Q: What is a shape with 20 triangles?

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An icosahedron.

Well, any shape with a triangular face. I assume that you mean a shape that only has (identical) triangles for faces. There are 2: the tetrahedron with 4 triangles, and the icosahedron with 20 triangles. * * * * * What about a triangular dipyramid? Two triangular pyramids stuck together along one face?

the shape that can make two smaller triangles is parallelogram.

Dodecahedron. The 5 "Platonic Solids" are: Cube/ 6 square sides Tetrahedron/ 4 triangles Rhomboid/ 8 triangles Dodecahedron/ 12 pentagons Icosahedron/ 20 triangles

Icosahedron are a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles.

Related questions

a geometric shape made up of 20 triangles. :)

An Icosahedron.

duodecahedron is a 3D shape that has 20 triangles as it's base

An icosahedron.

Well, any shape with a triangular face. I assume that you mean a shape that only has (identical) triangles for faces. There are 2: the tetrahedron with 4 triangles, and the icosahedron with 20 triangles. * * * * * What about a triangular dipyramid? Two triangular pyramids stuck together along one face?

the shape that can make two smaller triangles is parallelogram.

Dodecahedron. The 5 "Platonic Solids" are: Cube/ 6 square sides Tetrahedron/ 4 triangles Rhomboid/ 8 triangles Dodecahedron/ 12 pentagons Icosahedron/ 20 triangles

congruent triangles

An icosahedron is a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles. icos is Greek for 20

There can be no closed 3D shape with only one square and 3 triangles.

Icosahedron are a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles.

Icosahedron are a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles.