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Q: In the given truss bridge parallelogram ABCD and PQRS are congruent if AB 24 feet what is PQ?

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on a building, it apparently tells firement the building has a (R)egular roof as opposed to a truss roof. Truss roofs tend to colapse in fires, so firemen do not get on top of it.

The triangle is the strongest geometric shape, as it holds its shape and has a base which is very strong. The triangle is common in all sorts of building supports and trusses. If all three sides of a triangle 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 even collapse totally. If you take a rectangle and place one diagonal piece from corner to corner, you can make that strong and stable, too, but doing that makes two triangles.

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