A solid shape made out of eight equilateral triangles is called a triangular bipyramid. This polyhedron consists of two triangular pyramids (tetrahedra) joined at their bases, creating a three-dimensional figure with eight triangular faces, six edges, and four vertices. The symmetry and uniformity of the equilateral triangles give it a distinct geometric shape.
In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.It is a 3-dimensional cross polytope (shape).---Wikipedia
It is a tetrahedron pyramid
A tetrahedron
The Platonic solid known as an octahedron would fit the given description
Equilateral triangles, squares, regular pentagons.
It is a regular octahedron.
square
A net has two equilateral triangles and 3 rectangles. What solid figure might it make?
In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.It is a 3-dimensional cross polytope (shape).---Wikipedia
tetrahedron
It is a tetrahedron pyramid
equilateral triangles and regular pentagons
A tetrahedron
The Platonic solid known as an octahedron would fit the given description
10
Equilateral triangles, squares, regular pentagons.
The maximum number of equilateral triangles that can meet at a vertex to form a solid is 4. This configuration forms a tetrahedron, where each vertex is shared by four equilateral triangle faces. Any arrangement with more than four triangles at a single vertex would not be able to maintain the necessary geometric properties to form a solid.