A triangle must have straight lines.
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Oh, dude, are we building a bridge or planning a geometry heist? Well, technically speaking, an arch is stronger than a triangle because it can distribute weight more evenly. But hey, if you're just doodling shapes on a napkin, I don't think it really matters which one you pick.
An arch works by transfering the load on the central portion of the arch outward and downward into the columns which support it.
An arch or lintel supported by corbels, or protrusions from a wall.
any triangle is a triangle
The Jefferson National Expansion Memorial, The Gateway Arch, is located in St. Louis, Missouri.