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Introduction of Arches reduces the bending moment at cross sections due to presence of horizontal force at the support whenever bridge is loaded and thus requirement of cross section is lesser. When triangles are easy to propagate and can have tension/compression only if used as 2-point member in bridges (forces acts only the end of any member not in between), Due to absence of bending moment it also reduces the cross-section requirement. Therefore, if we introduce arches and triangles cross section requirements of each small member get reduced.

Q: Why was arches and triangles used in making a bridge?

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so the bridge cant fall down when the cars are on it. And the triagles can keep i

ford circle can be used for bridge making

Isosceles triangles can be used in domes

Triangles are used extensively because they are fundamentally rigid, because three line segments can define one and only one triangle. Compare a trianlge to, say, a square, which could flex at its vertices to form a rhombus. If you take a square, however, and insert one diagonal, you basically have two triangles, which make the square rigid and not prone to collapse. Arches are also fundamental in architecture because of the way they distribute weight to the pillars that support them. Arches also convert horizontal and lateral forces to vertical ones.

No it can only be used with right angle triangles.

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Apart from bridge building, arches are commonly used for doorways/openings. Throughout history arches have been used to spread vertical loads to create openings. Examples range from small garden arches to the Colosseum.

one example is in a bridge.

only two arches are used to hold it hope this helped!

Triangles

Arch bridges are made from arches. Arches are typically made from brick, reinforced concrete, stone or steel. Wooden arches are sometimes used for ornamental bridges, such as decorative footbridges in gardens.

A Warren Truss Bridge is used to cross certain obstacles. The Warren Truss bridge is Constructed with equilateral triangles so, this relieves of Compression and Tension.

Where the Arches Used To Be was created in 1935.

so the bridge cant fall down when the cars are on it. And the triagles can keep i

in the construction the arches are especially used for elevation purpose and for making tunnels also now a days these arches are useful in construction for beauty purpose

to shut up

Steel

ford circle can be used for bridge making