A 10-sided die has 10 triangular faces.
If the base of the pyramid is a triangle then all its faces would be triangular in shape.
The tetrahedron has 4 equilateral triangles as its faces.
pyramid
The geometric shape that has 1 square face and 4 triangular faces is a pyramid. A pyramid also has five vertices and eight edges. The square acts as the base for the shape on which it sits.
The solid shape that has one square face and four triangular faces is called a pyramid. If you were to have a shape that had four triangular faces and no square face, it would be called a triangular pyramid.
A cuboid prism has no triangular faces
An octagon is a plane shape with just one face - an octagonal face! It cannot have triangular faces.
A 10-sided die has 10 triangular faces.
Triangular prisim
There is no 3-d shape with 4 and 1 = 5 triangular faces.
The shape you are describing is a triangular pyramid. A triangular pyramid has a base that is a triangle and three triangular faces that meet at a single point called the apex. The base of the pyramid is a rectangle, which is a quadrilateral with four right angles. The triangular faces of the pyramid connect the vertices of the base to the apex.
If the base of the pyramid is a triangle then all its faces would be triangular in shape.
A hexahedron or a triangular dipyramid. This is the shape formed by two triangular pyramids (tetrahedrons) stuck together along one triangular face.
A square based pyramid.
hexagonal pyramid
The tetrahedron has 4 equilateral triangles as its faces.