a form of masonry reinforced with imbedded iron bars that is regarded as the precursor of reinforced concrete. English builders began relying on iron in the construction of factories about 1850
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web can use it for making building construction machine.
Building engineers use math to help them figure out how big or how small to make the house or whatever they are building.
Engineering, construction, etc.
A straightedge and compass.
i dont know why you asking me