Why is force multiplied by a/2 to find torsion at point C?

[Amaelle]

Summary:: trying to calculate the torsion but couldn´t understand the solution

Greetings
I´m trying to understand why the multiplied the Force by a/2 to find the torsion in te point c
thank you!

 

[Lnewqban]

They are dividing the force F by 2, not the a distance.
F/2 is the magnitude of each reaction force at support points A and E.

 

[Amaelle]

thanks a million!

 

[Lnewqban]

You are welcome, Amaelle.