What you are looking for are driven dimensions. Derived dimensions must be a typo. Driven dimensions are enclosed in parentheses to distinguish them from regular dimensions in inventor. These dimensions do not contrain a sketch they simply reflect dimensioned geometry which is most likely under some geometric constraint.
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In 2 dimensions, a regular 5 sided figure is a pentagon. In 3 dimensions, there is no regular sided 5 sided figure. The tetrahedron is a regular 4 sided figure and a cube is a regular 6 sided figure.
All the sides of a regular polygon have the same length. If two or more sides of a polygon have different lengths, then the polygon is not regular.
A 3D cross is called a "cross polytope" or a "hypercube." In geometry, a cross polytope is a geometric shape that extends into three dimensions and is formed by connecting the vertices of a regular polygon in one dimension with the vertices of a regular polygon in another dimension. The term "hypercube" is often used to refer to a specific type of cross polytope, specifically a four-dimensional shape that extends the concept of a cube into higher dimensions.
An acre is a unit of area. It can have many different dimensions and can be in any shape, including regular and irregular polygons. The square footage for 1 acre is 43560 square feet.
A rectangular number sequence is the sequence of numbers of counters needed to construct a sequence of rectangles, where the dimensions of the sides of the rectangles are whole numbers and change in a regular way. The individual sequences representing the sides are usually arithmetic progressions, but could in principle be given by difference equations, geometric progressions, or functions of the dimensions of the sides of previous rectangles in the sequence.