Kite

The kite has two pairs of two pairs of equal-length sides.
length a
length b
diagonal f
length a
length b
diagonal f
Circumfirence U=2(a+b)
Diagonal f=sqrt(2*(a*a*b*b+a*a*e*e+b*b*e*e)-a^4-b^4-e^4)/e
Section p=(a*a-b*b+e*e)/(2*e)
Section q=(-a*a+b*b+e*e)/(2*e)
Area A=e*f/2
Angle alpha= arccos((-a*a+b*b+e*e)/(2*a*e))
Angle beta= arccos((-a*a-b*b+e*e)/(2*a*b))
Angle gamma= 2*arccos((a*a-b*b+e*e)/(2*e*b))
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