Applied Mechanics and Graphic Statics
The resultant of two forces ‘P’ and ‘Q’ acting at an angle ‘θ’, is

P² + Q² + 2PQ tan θ
P² + Q² + 2PQ cos θ
P² + Q² + 2P sin θ
√(P² + Q² + 2PQ cos θ)

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Applied Mechanics and Graphic Statics
The characteristic of a couple is:

All listed here
Algebraic sum of forces, constituting a couple is zero
A couple can be never the balanced by a single force
Algebraic sum of moments of forces, constituting a couple, about any point, is same

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