What do you mean by “strong,” and for what purpose?
For building? arches and domes. Arches and domes are probably the most durable geometric shapes one could build. I know that arches are completely self-supporting. If more weight is placed on top of an arch, the structure strengthens. In other words, as you add weight to the top, each piece of the arch is pushed toward the next, creating a stronger bond. This is actually how you strengthen a deteriorating arch–by adding additional weight to it! I’m assuming you could, to a degree, strengthen a dome in the same way.
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