1.

The relation between lift coefficient and moment coefficient about the leading edge is_______

A. c<sub>m,le</sub>=-( ( frac {c_l}{2}+ frac { pi }{4} )(A<sub>1</sub>-A<sub>2</sub>))
B. c<sub>m,le</sub>=-( ( frac {c_l}{4}+ frac { pi }{4} )(A<sub>1</sub>-A<sub>2</sub>))
C. c<sub>m,le</sub>=-( ( frac {c_l}{4} )+(A<sub>1</sub>-A<sub>2</sub>))
D. c<sub>m,le</sub>=( ( frac {c_l}{2}+ frac { pi }{4} )(A<sub>1</sub>-A<sub>2</sub>))
Answer» C. c<sub>m,le</sub>=-( ( frac {c_l}{4} )+(A<sub>1</sub>-A<sub>2</sub>))


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