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I know what pressure and friction drag are, I am having a hard time trying to find out how can you calculate the coefficient of drag for them?

I think i have came across an equation for it: F[itex]_{D}[/itex] = .5*ρ*v[itex]^{2}[/itex]*A*C[itex]_{D}[/itex]

where F[itex]_{D}[/itex] is the force of drag, ρ is density, v is velocity, A is the contact area and C[itex]_{D}[/itex] is the coefficent of drag

is there any other equation used to calculate C[itex]_{D}[/itex]?