Why Does the Incline Angle Start Differently in Fluid Dynamics Problems?

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petersun825
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While working on fluid dynamics problems I noticed that the incline angle sometimes starts at middle while other times starts at one end. Is there an explanation for this?

I know the slope =(linear a)/(gravitational g)
 

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Read the problem statements.
 
It probably has to do with convenience of coordinate system definition for a given problem.