All sides have the same length.
Side length a=
Distance between two sides h=


Side length a=
Distance between two sides h=
Circumfirence U=4a =
Area A=a*h =
Angle alpha=arcsin(A/(a*a)) =
Diagonal e=2*a*cos(alpha/2) =
Diagonal f=2*a*sin(alpha/2) =
Radius of inner circle r=a/2*sin(alpha) =



Description at Wikipedia

deesRhombus
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