So basically, use the cosine law. Eg.
r2=a2+b2-2(ab)cos C. For angles use the compass rose, and remember the z rule, opposite angles are always equal
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You can add the vectors graphically - join them head-to-tail. Or you can solve them algebraically: you can separate them into components, and add the components.
To find the resultant force you need to find both the x and y component of the resultant force. Once you have that, you can use the Pythagorean theorem to find the resultant force.
a resultant vector not only the resultant of two or three vector. it is the resultant direction of two or many vectors.(let us push an object with same force in opposite direction the resultant is zero and if we push in same direction the force will double.if we pull a object with same force in x and y direction the resultant force in 45 degrees to x axis)
A couple.
The Resultant Vector minus the other vector