Congruent Structures Give Strength To Bridges In Real Life

While working on the bridge, I was asking how do congruent structures give strength to bridges in real life? I think congruent structures give strength to the bridge because triangles have their rigid shape and strength. Unlike a square, that can shift into a parallelogram when force is applied to one of its sides, an equilateral triangle’s sides and angles are fixed. For example, triangles have beam which are the rigid shapes that helps the abutments of the bridge. When triangles supports the abutments of the bridge, it also supports the decking of the bridge which helps to hold the roadway. Also when it helps to hold the roadway, it can also make the roadway to live load which people or cars can move on the bridge. I think more congruent