Hello,

Your question is incomplete and here is no place for a figure. It's okay. But i can't solve it here with thoery. This needs proper mathematical derivation.

This question can be solved if you understand the basics. There are many formulas and tricks given to solve these problems. You can refer it.

If you have any mentor or any guide for this subject then you should go and ask him/her to solve the problem for you step-wise so that if you encounter the same problem you can solve it with a strong mindset and not get confused easily.

Hope it helps!