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.
Know MoreSingle-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."
Learn MoreOctahedra have eight faces. The answer to this question actually lies in the shape's name because the prefix "octa-" means "eight."
Full Answer >Shapes can have an infinite number of sides, but one example with a large number of sides is the googolgon, which has 10^{100} sides. Other examples of shapes with a large number of sides include the chiliagon (1,000), myriagon (10,000) and megagon (1,000,000).
Full Answer >A trapezoid is a quadrilateral with two parallel sides and, usually, two nonparallel sides. A quadrilateral is a geometric shape that has four sides. Some specialized types of trapezoid are the parallelogram and the isosceles trapezoid.
Full Answer >An octagon has 20 diagonals. A shape's diagonals are determined by counting its number of sides, subtracting three and multiplying that number by the original number of sides. This number is then divided by two to equal the number of diagonals.
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