i am a polyhedron

all of my faces are the same
all of my faces are equilateral triangles
i have 8 faces. what am i?

http://www.mathsisfun.com/platonic_solids.html

What do you think?

I am a polyhedron i have 5 faces four of my faces are triangles my base is a square

Based on the given information, you are describing a specific polyhedron known as an Octahedron.

An Octahedron is a three-dimensional geometric shape that has 8 faces, and each face is an equilateral triangle. To identify it as an Octahedron, we can follow a few steps:

1. Count the number of faces: You mentioned that the polyhedron has 8 faces.

2. Examine the shape of the faces: You stated that all of the faces are equilateral triangles.

Combining these characteristics, the only polyhedron that fulfills these requirements is an Octahedron.