A pyramid.
a pyramid
A triangular pyramid. It has triangles on its 3 sides and a triangle on the bottom for a base.
A 3D shape with one base and three faces can only have triangular faces.
A triangular base pyramid would fit the description.
The simplest such shape is PYRAMID.
This would be a triangular prism.
A 3D shape with all triangular faces can be a tetrahedron pyramid.
triangular prisom
A triangular pyramid.
An icosahedron.
Numerous 3D shapes incorporate triangles in their structure. Common examples include tetrahedra, which are made entirely of triangular faces, as well as pyramids, which have a triangular base and triangular sides. Other shapes like triangular prisms and certain types of polyhedra also feature triangles as part of their geometry. Essentially, any polyhedron can contain triangular faces, making the number of 3D shapes with triangles quite extensive.
square based pyramid