Applied Mechanics and Graphic Statics
The angle of friction is:

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

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Applied Mechanics and Graphic Statics
Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by

The diagonal of the parallelogram which passes through the point of intersection of the forces
Its longer side
The diagonal of the parallelogram which does not pass through the point of intersection of the forces
Its shorter side

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