Aren't triangles structurally strong? So they are used in bridges and architechture.
The geometric shape used in truss bridges is the triangle.
Triangles are used in structures because a triangle is a very stable shape that cannot be stretched or squashed easily - unlike rectangles which can easily become parallelograms.
Hyperbolic cosines, parabolas, semicircles, triangles are some shapes.
Triangles
Concrete and steel .
The Romans used the arch to build large buildings and bridges.
The designs that are used to build bridges are designs that can keep them stable , working and that won't be dangerous also designs that amaze people.
so the bridge cant fall down when the cars are on it. And the triagles can keep i
Ones that make use of triangles.
brick,mud,wood
Mostly congruent triangles are used for construction of things like bridges and buildings because they are considered more stable and strong to use (i hope that helps i had to learn this for a project)