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An Icosahedron.
A triangular prisim (3 faces on sides, one face on bottom).
A square and rectangle both have congruent triangles in them.
congruent triangles
Congruent Triangles have the same angles and side length measures
An Icosahedron.
An icosahedron.
This shape is called a Icosahedron , I think.
square based pyramid
A hexagon based pyramid.
A triangular prisim (3 faces on sides, one face on bottom).
The shape you are describing is a prism, specifically a triangular prism. It has two congruent triangular bases and three rectangular faces connecting the corresponding sides of the triangles. This 3D shape maintains the same cross-section along its length, resulting in the congruent triangles and the rectangular sides.
If the triangles are congruent then it is a triangular-based prism.
You are a triangular based pyramid (tetahedron) with 4 faces, 6 edges and 4 vertices.
The parallel faces of a triangular prism are both shaped like triangles. These triangular faces are congruent, meaning they have the same size and shape. The other three faces of the prism, which connect the corresponding sides of the triangles, are rectangular.
A square and rectangle both have congruent triangles in them.
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.