Yes. Usually you consider the resultant of the normal force and friction to be the reaction. This resultant will not be perpendicular to the surface.
Yes. Usually there is not much we can say about the precise angle though, unless the body is on the point of slipping i.e. we have reached the value of limiting friction. When this happens, the reaction is often called the "total reaction", and with normal reaction
N, coefficient of friction
μ, it has components:
R⊥=NR∥=μNand it makes an angle
θ with the normal to the surface, where:
tanθ=R⊥R∥=NμN=μThen
θ is often called the "angle of friction". (Exercise: I place a mass on a rough surface, coefficient of friction
μ, making angle
θ with the horizontal. At what value of
θ does the mass start to slip?)