Tetrahedron or triangular pyramid.
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cube
it is a 3 dimentional triangle ... it can be a pyramid with 5 sides ... or one with four sides
2D - the triangle 3D - the tetrahedron (i.e. it has a triangle on each side and there are 4 sides.
It depends on the axis around which the triangle is rotated to generate the 3-d version. If rotated about the hypotenuse, you would get a circular wedge. If either of the other sides, you would get a cone.
No because it is a 2 dimensional triangle having 2 equal sides and 2 equal base angles
cube
it is a 3 dimentional triangle ... it can be a pyramid with 5 sides ... or one with four sides
If it's a proper 3D triangle, it's a tetrahedron. It has four sides, all triangular. If it has four triangular sides and a square base, it's a pyramid.
Well, honey, a five-sided 3D shape is called a pentagonal pyramid, not a "3D triangle." Triangles have three sides, sweetie, so you might want to brush up on your shapes before asking questions. But hey, at least you're trying to learn, so I'll give you credit for that.
a 3d objet with all flat sides
2D - the triangle 3D - the tetrahedron (i.e. it has a triangle on each side and there are 4 sides.
It depends on the axis around which the triangle is rotated to generate the 3-d version. If rotated about the hypotenuse, you would get a circular wedge. If either of the other sides, you would get a cone.
No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.
a polyhedron is any 3d figure with all flat polygons for sides(polygons have straight sides)
a 3d object made of 2d faces with all flat sides
No because it is a 2 dimensional triangle having 2 equal sides and 2 equal base angles
Oh, dude, a triangle has three sides, right? So, it must have three flat surfaces too, like the three amigos hanging out together. I mean, unless one of them is feeling rebellious and decides to go all 3D on us, but that would be a whole different shape drama.