A Tetrahedron has four triangular sides.
The only thing I can come up with would be a tetrahedron. You could make a pyramid with a square (open) base, I guess.
equilateral triangles and regular pentagons
4.
It is a regular octahedron.
No, only right triangles
Tetrahedron.
rhombus
A square pyramid.
yolo
It is a tetrahedron pyramid
Tetrahedron
A tetrahedron
A pyramid.
A pyramid with a triangular base. The faces are 4 equilateral triangles.
Pyramid. Work: 4 sides (that you usually see) are triangles, the base (bottom) is a square
You can make square pyramid.
A square-based pyramid