In geometry, a heptagon is a seven-sided polygon or 7-gon. The heptagon is sometimes referred to as the septagon, using “sept-” (an elision of septua-, a Latin-derived numerical prefix, rather than hepta-, a Greek-derived numerical prefix; both are cognate) together with the Greek suffix “-agon” meaning angle.

enneagon

There is no polygon with one side, because the definition of a polygon is “a 2-dimensional closed shape”. The minimum number of sides which can close the figure is 3.. One side: a line which is one dimensional.

triangle

• Oval.
• Circle.
• Square.
• Rectangle.
• Triangle.
• Diamond.

For hexagonal close-packed it gets considerably more complex but triangles can still be involved. “Triangles” just in general are not the strongest shape. If you have a solid block of wood shaped like a triangle, versus a solid block of wood shaped like a pentagon, they’ll hold the same weight and what-not.

Answer: The triangle is the strongest to as it holds it shape and has a base which is very strong a also has a strong support. The triangle is common in all sorts of building supports and trusses.

The Rolling Bridge

The most sturdy of the triangles are equilateral and isosceles; their symmetry aids in distributing weight.

Why Triangles are a Strong Shape One of the shapes that can bear weight very well is the triangle. When a force (the load) is applied to one of the corners of a triangle, it is distributed down each side. The two sides of the triangle are squeezed. Another word for this squeezing is compression.

The strongest shapes are the triangles. They distribute all the weight on top of the point through the sides and out over the base. When you build with the triangles and cross pieces, you should see the least amount of bowing and buckling.

TL;DR: The strength of the structure depends more on the material it is made of. Triangles can be used to make a structure as strong as an arc, however on a one-to-one comparison, a single arced structure will be able to support more load than a simple triangular structure.

Based on the incremental deflection averages, the truss bridge is 10.0736 stronger than the span/beam bridge and 3.4561 stronger than the arch bridge. It is concluded that the truss bridge was the strongest from its increased weight and its geometric design of spreading the compression with a triangular design.

The strongest column has an equilateral triangle as cross section, and it is tapered along its length, being thickest in the middle and thinnest at its ends. Its buckling load is 61.2% larger than that of a circular cylinder.

Truss bridges are extremely effective because they have a high strength to weight ratio. In this experiment we have tested which type of truss bridge is the strongest, yet uses the least amount of material. Two of the most used truss bridges are of the Pratt and Howe design.

Beam Bridge Weight Distribution The weight placed on a beam bridge is pressed directly downward, toward any underneath support, which makes the middle portion of the bridge the weakest.

The arch bridge can hold the most weight of the three, the deck truss bridge can hold an average amount of weight, and the beam bridge could hold the least amount of weight.

Here is a list of the 7 most expensive bridges ever built.

• USA – Verrazano-Narrows Bridge, $2.4 Billion.
• South Korea – Yeongjong Grand Bridge, $1.9 Billion.
• China – Tsing Ma Bridge, China, $1.35 billion.
• USA – Oakland Bay Bridge, $1.3 Billion.
• USA – George Washington Bridge, $1.1 Billion.