Why is it necessary to do a vector resolution problem using the force of Static Friction, in order to theoretically determine the Angle of Repose?

Question
Why is it necessary to do a vector resolution problem using the force of Static Friction, in order to theoretically determine the Angle of Repose?

What does a very low Angle of Repose tell you about the kind of surface at play?

What does it tell you about the Coefficient of Static Friction?

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