Applied Mechanics and Graphic Statics
The resolved part of the resultant of two forces inclined at an angle θ in a given direction is

Arithmetical sum of the resolved parts of the forces in the direction
Algebraic sum of the resolved parts of the forces in the direction
Sum of the forces multiplied by the tangent θ°
Difference of the forces multiplied by cosine θ°

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Applied Mechanics and Graphic Statics
The angle of friction is:

The force of friction when the body is in motion
The ratio of the friction and the normal reaction
The force of friction at which the body is just about to move
The angle between the normal reaction and the resultant of normal reaction and limiting friction

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