# Lami's theorm

**This is a short article about Lami's theorem. How to use Lami's theorem has also been discussed. This theorem is used for the solution of three vector quantities.**

# Lami's theorem

Lami's theorem is very helpful tool in mechanics to solve various problems that include exactly three vector quantities.

## What is Lami's theorem ?

Lami's theorem states that if three co-planer forces are acting on the same point then each force is proportional to the sine of the angle between other two forces.

**Formula**

This formula is given as:

**Explanation**

Consider three forces:

Let OA = F3

OB = F1

OC = F2

Also note that

* Angle opposite to OA is "alpha".

* Angle opposite to OB is "Beta".

* Angle opposite to OC is "Gamma".