Hydraulics & Fluid Mechanics
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

the area is horizontal
the area is vertical
All of these
the area is inclined

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Hydraulics & Fluid Mechanics
The horizontal component of force on a curved surface is equal to the

force on a vertical projection of the curved surface
force on the horizontal projection of the curved surface
weight of liquid vertically above the curved surface
product of pressure intensity at its centroid and area

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