three things i have without hangups:

trapezium wing:2(cr+ct)/2)1/2 b= area wing

diamond wing:2(cr+ct)+0,3cr)1/2b)=y(x)dx=2(cr+0,3cr/2)1/2b=area wing

double diamond wing:2(cr+xcr/2)0,35b)+2(xcr+0,3cr/2)0,15b=area wing

b=y(x)dx,b is unknown->

2(a+b)=y(x)dx=area wing->cx=(cr-0,3cr)

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