A tetrahedron.
Assuming that a solid triangle is a tetrahedron, the answer is: faces: 4 edges: 6 vertices: 4
it has 4 faces and each face is a triangle.
Poy
Pyràmid
4
its a triangle, circle,
Tetrahedron
a pyramid, in the sense that most people think of has a square base, with 4 triangle 'sides', which would be 5 faces. A regular tetrahedron has 4 equilateral triangles as faces.
Oh, dude, you're talking about a square pyramid! It's like a pyramid, but with a square base and four triangular faces. So, technically, it has 5 faces in total. Math can be fun, right?
a triangle- based pyramid has 4 faces
A tetrahedron (4 faces) and an icosahedron (20).