Hi, just wondering if anyone could help me out with the KDR i have for Aerodynamics.

Part 61 MOS 1.3.1 CADC 2.4.1(A) (Lift and Drag Formula)

The question is:
Explain the meaning of the term used in Lift/Drag Formula "CL and CD depend upon the shape and the and of attack of an aerofoil"

Tried looking this up in the Bob Tait Aerodynamics book and couldnt seem to find an answer.

any help would be greatly appreciated.

Cheers,

Tanser