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# Lami's theorm

 Updated: 03-Apr-2011 Category: Education Author: Ankit Sharma Member Level: Gold Points: 10

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".

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