Parallelogram method to calculate the resultant force

[Jadaav]

In school, we've been using the parallelogram method to calculate the resultant force of 2 forces.

I've noticed the teacher using his calculator to give the answer, so I think there must be a formula to calculate Resultant force.

Can someone tell me the formula please ?

 

[mathman]

Step 1 add the two vectors (i.e. get the resultant vector components by adding the components of each vector). Step 2 get the magnitude using Pythagorean theorem.

 

[ashishsinghal]

magnitude of resultant force of two forces of magnitude a and b at angle x is given by
R = sqrt(a^2 + b^2 + 2abcosx)

 

[Jadaav]

Thanks everyone.

That was what I was searching for.