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The drag coefficient is a number which aerodynamicists use to model all of the complex dependencies

of drag on shape inclination, and some flow conditions. The drag coefficient (Cd) is

equal to the drag (D) divided by the quantity: density (r) times reference area (A) times one half

of the velocity (V) squared.

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does not include the surface friction aspect of the problem, why is that, is this a simplified equation?