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This angle of friction is best defined with this figure:

Angle of Friction” = C

In the figure above, you can find an angle made with normal reaction or N and the force by friction or F. As a result you will get an equation:

Tan ϕ = F /N which is then equal to µ N / N = µ

So we get the angle of friction, ϕ = tan -1 µ