Engineering Mechanics
Angle of friction is the

Angle between normal reaction and the resultant of normal reaction and the limiting friction
Ratio of limiting friction and normal reaction
The ratio of minimum friction force to the friction force acting when the body is just about to move
The ratio of minimum friction force to friction force acting when the body is in motion

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Engineering Mechanics
The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

The sum of the forces multiplied by the sine of θ
The difference of the forces multiplied by the cosine of θ
The sum of the resolved parts of the forces in the given direction
The algebraic sum of the resolved parts of the forces in the given direction

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