Hello! I hope you are well.I don't understanf how we can state that the moment of Fa around B is FaL. Because as theta increases, the distance between A and B decreases : it isn't constantly L.

International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter9: Moments And Products Of Inertia Of Areas
Section: Chapter Questions
Problem 9.91RP: For the shaded region shown, determine (a) Ix and Iy; and (b) Ix and Iy using the parallel axis...
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Hello! I hope you are well.

I don't understanf how we can state that the moment of Fa around B is FaL. Because as theta increases, the distance between A and B decreases : it isn't constantly L. 

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