How to determine the size of a support rib?

In the pic you see simple "L" structure, I need to support it with the rib as shown to prevent tilt. I do know it is a matter of counterweight but how can you simulate/determine the size/angle of the rib ?

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1 Answer

You must use 45deg. angle and use the width for the rib as 75% of "L" structure width it will be safe your support

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