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ARCHITECTURALELEMENTS BUILDINGSTRONGSHAPESWhat is the strongest geometric shape?There are several shapes that are used when strength is important. The arc (think: circle) is the strongest structural shape, and in nature, the sphere is the strongest 3-d shape. The reason being is that stress is distributed equally along the arc instead of concentrating at any one point.Storage silos, storage tanks, diving helmets, space helmets, gas tanks, bubbles, planets, etc. use cylinder or sphere shapes --or both.THE CIRCLE The triangle is the strongest to as it holds it shape and has a base which is very strong a also has a strong support. The triangle is common in all sorts of building supports and trusses. It is strong because the three legs of a triangle define one and only one triangle. If all three sides are made of rigid material, the angles are fixed and cannot get larger or smaller without breaking at the joints, unlike a rectangle, for example, which can turn into a parallelogram and ev...