No, they are 2D shapes.. 3D is like Cube and cylinder etc.
An equilateral triangle has sides and angles. There are 3 sides in any triangle. Edges are in three dimensional figures.
2 dimensional figures just have width and length, if you were to add the height dimension it would become 3 dimensional.
3dimentional figures are solid figures.
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The three dimensional figures are called Space figures
There are infinitely many types of 3 dimensional figures. It is impossible to name them all.
Figures that take up space.
Anything 3 dimensional is solid.
Tetrahedron
No. A triangle is a two-dimensional object, therefore it is not three-dimensional.
A plane figure is 2-dimensional.
the triangle