PLEAS solve it in simple easy way and explain it to me i need to understand it $!!$ might come in my medterm exam

$3\mathrm{.}75$ For the curved surface $AB$ :

a$.$ Determine the magnitude, direction, and line of action of the vertical component of hydrostatic force acting on the surface. Here $l=1m.$

b$.$ Determine the magnitude, direction, and line of action of the horizontal component of hydrostatic force acting on the surface.

c$.$ Determine the resultant budrostatic force acting on the surface