The base of a tetrahedron has 3 that are of equal length; essentially, it's made up of four equilateral triangles (hence the 'tetra'). A pyramid base has 4 sides of the same length. in fact, There are actually an infinite number of such 'pyramid-like' objects, with different numbers of sides on the base.
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To be 3 dimensional the sides must also have height.
A cube is a three dimensional object with all sides of equal length. A rectangle is a two dimensional figure with two pairs of sides equal in length. Three dimensional is like a rubrics cube, something you can hold. A two dimensional figure is something you can not hold, a drawing is two dimensional.
A sphere is a round object. It has no sides. The object is 3-D. (Three Dimensional)
A box is a three dimensional object, and you have only stated one dimension. _________________________________________________________________ A box has all of the same length sides. The volume of the box is 27mm3.
No. A triangle can be a two-dimensional object whereas a pyramid must be three-dimensional (with sides that are sloped).