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Dams and tall buildings are made broader at the bottom because if the area is small then a larger pressure will be exerted and the foundation of the building may also break.
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more pressure will experience at the bottom of the dam. to reduce the effect of pressuredams are made broader at the bottom
Comment has been deleted
We know that :
smaller the area - larger the pressure on the surface 
to make sure the foundation of the tall buildings and dams are strong, they are built with a broader basement .so, if the area in the bottom is higher then the pressure exerted by the buildings and dams on the ground would automatically be less . 

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did i help ??,..... rate me if i did ;-)
what is pressure exerted by a building? it is not a liquid..
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