Q: What is the opposite of a 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.

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.

There are 8 lines of symmetry. Those that bisect opposite sides and opposite vertexes.

Yes:As the shape is regular all sides are equal in length (and congruent).An octagon has 8 sides. As this is an even number of sides, the opposite sides are parallel.

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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.

A regular octagon's angles and sides are all the same. As in the angles are the same, and the lengths of each side are the same. And irregular is basically the opposite of that.

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.

There are 8 lines of symmetry. Those that bisect opposite sides and opposite vertexes.

Yes:As the shape is regular all sides are equal in length (and congruent).An octagon has 8 sides. As this is an even number of sides, the opposite sides are parallel.

If the "8 by 8 octagon" refers to the distances between its opposite sides rather than opposite vertices (its principal diagonals), then the side lengths are 8*[sqrt(2) - 1] units of length.

8. 4 between the opposite vertices 4 between the mid points of opposite sides.

An octagon is neither a quadrilateral nor a parallelogram. "Quadrilateral" refers to a shape that has four sides. "Parallelogram" refers to a shape that has two pairs of opposite, congruent sides. An octagon has eight sides, and since eight is not equal to four, an octagon is neither a quadrilateral nor a parallelogram.

I am a square or a rectangle or maybe even a hexagon, octagon, or decagon...

Any even-sided, regular shape will have opposite sides parallel. A square, hexagon, octagon and decagon are just four examples !

I'm not sure what you mean by "total height". I guess you mean the perpendicular distance between two parallel opposite sides. Draw the two diagonals to the opposite vertices from one side; they meet at the centre of the octagon, creating an isosceles triangle with the side of the octagon. The perpendicular height from the centre to the side is height/2 The angle at the centre is 360°/8 = 45° (as there are 8 such triangles). The angle at each end of the octagon side is (180° - 45°)/2 = 62.5° Drop a perpendicular from the centre of the octagon to the side of the octagon in this triangle. This forms a right angle triangle with one side height octagon/2, side octagon/2 and hypotenuse largest diagonal/2 → Tan 62.5° = (height/2) / (side/2) = height/side → side = height/tan 62.5° = 85in/tan 62.5° ≈ 44.25 in