Which of the following is an incorrect relation for a flat plate?

• A. cm,le=-π \(\frac {\alpha }{2}\)
• B. cm,le=-\(\frac {c_l}{4}\)
• C. cm,le=-\(\frac {c_l}{2}\)
• D. cm,c/4=cm,le+\(\frac {c_l}{4}\)