Well, it depends. If it is a solid shape,such as a cube, that would be 3 dimensional or 3D. But if it is just a plane shape, like a square, that would be 0 dimensions, or if you wish to call it, 0D (But that is not the way to say it).
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A triangle has 3 sides and 3 inside angles that add up to 180 degrees. If you are asking about physical dimensions, a triangle is a two-dimensional shape.
cube
A shape having the same dimensions of length, height and width is a cube. This can also be referred to as a square prism.
square, rectangle etc. In two dimensions: a quadrilateral. In three dimensions: a tetrahedron.