an octagon...
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No. It is the opposite sides of a regular octagon that are parallel and congruent.
An octagon has four (4) diagonals, each connecting two opposite vertices.
There are 8 lines of symmetry. Those that bisect opposite sides and opposite vertexes.
Half an octagon has five sides is it is divided in two by a line joining opposite vertices. It has six sides in the dividing line joins the midpoints of opposite sides.
To draw an octagon with two right angles and two lines of symmetry, start by drawing a regular octagon. Then, identify two opposite vertices and draw a perpendicular line from each of these vertices to the opposite side. This will create two right angles within the octagon. Finally, draw lines of symmetry by connecting the midpoints of opposite sides, creating two lines of symmetry that pass through opposite vertices.