## 15 Reputation

1 years, 102 days

## Indeed for the system to be constrained ...

Many thanks to you all. Indeed I was mistaken to think this was solvable. I need one more constraint if the problem is to be solavable. I am very gracious for the support of you all for your time on this. Again, many thanks!

## Thanks...

Thanks and sorry @vv only the Lij's drawn are known.

Shouldn't this be a simple geometry problem?

To solve for each quadralateral I need to know all sides and one angle (not known). Since I have two quadralateral's I should be able to set the common (unknown) angle next to point 3 as being equal in each quadralateral and solve for the unknown Lij's and all angles? Why am I struggling?

## Solving for the unknown values though....

Thasnk @vv , this is an interesting answer and approach. Only a few of the L[k,0] and L[k,1] values are known and infact solving for the unknown values is what I am trying to do.

I had thought I could come to a solution by applying the cosine law as @Rouben Rostamian was suggesting but after trying multiple ways I am still without a solution.

geometry.mw

## Indeed...

Thanks @Rouben Rostamian, indeed this is how I set it up in the Maple worksheet which is appended above. I have approached the problem from a few angles in the file which is appended now. Maple always gets stuck when I try to solve for the solution. As you say I would not have thought this to be remarkable.

## Almost there...

Thanks @Rouben Rostamian

@dharr 1223 noticed that I was providing too many initial conditions which was apparently preventing dsolve from working. Phi, theta and psi change in time and I do not need to solve for them.

So equation 20 in the appended is my equation for S between time 0 and time t I guess?

## Yup...

Thansk @dharr, yes you called.it!

## solving ODE...

Thanks @Rouben Rostamian  ;

In equation 13 of the appended. I attmept to descibe the relationship between S dotdot(t) and py1 as an ODE.

I would like to solve for S(t).

## Thanks, is this better?...

Thanks @Carl Love