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No not every quadrilateral can be a regular polygon.
32. 16 through opposite vertices and 16 through the centres of opposite sides.
A regular pentagon has 5 lines of symmetry, running from each vertex to the midpoint of the opposite side. These lines are not to be confused with the five lines it takes to draw a pentagon. Every regular polygon has as many lines of symmetry as there are lines in the polygon.An irregular pentagon may have none or 1 line of symmetry.
In a regular heptagon, there are 7 lines of symmetry because there is one line of symmetry for every side.
The apothem is the distance from the center to the middle of any side on a regular polygon. That is, a shape with every single side and angle the same.