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Q:

# What are 3-D shapes?

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Three-dimensional shapes are solid shapes that exist in three dimensions, which include length, width and depth. The main difference between 3-D shapes and 1-D or 2-D shapes is that depth is incorporated along a third axis outside of the original 2-D plane.

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Single-dimensional shapes exist only in one dimension, which means that they only possess length. Two-dimensional shapes have two dimensions, including length and width. These shapes are always flat. Examples of 2-D shapes are squares, triangles and circles. By adding an additional dimension to these 2-D shapes, many 3-D shapes can be constructed, such as cubes, pyramids and spheres. The mathematical term for a solid 3-D shape is "polyhedron."

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## Related Questions

• A:

A tangram set is made up of one square, one parallelogram and five triangles. Two of the triangles are small at half the size of the square. One triangle is three times the size of the small triangles, and two triangles are six times the size of the small triangles.

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Some commonly-known shapes are squares, circles, triangles, stars and rectangles. There are many different kinds of polygons used in geometry and many shapes that combine or arrange multiple polygons to be used in designs.

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Irregular shapes are those with sides of different lengths and angles that are unequal. Regular shapes have sides with equal lengths and have angles of the same size.