In calculating the drag force using CD the are used is

1.	In calculating the drag force using CD the are used is
A.	always the frontal area
B.	the planform area when the body is flat like an airfoil
C.	the planform area when the body is bluff like a sphere
D.	always the planform area
E.	Lateral area
Answer» C. the planform area when the body is bluff like a sphere

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