Why do the pillars of a bridge have a broader base than the top? - Vidyadip

Question

Why do the pillars of a bridge have a broader base than the top?

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Answer

Pillars of a bridge have a broader base than the top. This is done to reduce the pressure exerted on the ground by the enormous weight of the bridge. As pressure is inversely proportional to the area of contact, so if the base is broader, the area of the contact increases, reducing the pressure on the ground due to the weight of
the bridge.

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