How exactly does a planned demolition of a building work? How do they pick where to put the bombs?

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I’ve always been curious. How do they know all these things because the buildings always fall down nearly perfectly?

In: Engineering

They’ve studied structural engineering and demolition for many many years in order to know where the load bearing beams are and how a building is constructed (based on the blueprints), so they know where to place the explosives and in which order to detonate them so that the building collapses in on itself.