There are lots of 3 dimensional shapes, like spheres, cubes, rectangular prisms, triangular prisms, pyramids, tetrahedrons, the list could go on forever.
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take, for an example, a duck. This is a 3d shape because it has three dimensions. Compare this to a square, which is 2d. the difference is that the duck has a beak, and the square does not.
An irregular hexagon.
A triangle has three sides and three angles that total 180 degrees.
A triangle has three faces. In geometry, a face refers to a flat surface of a solid shape. Since a triangle is a two-dimensional shape with three sides, it has three faces. Each side of the triangle forms one of its three faces.
It is a cylinder since it has three bases of measurement rather than the two that a circle has.