2 opposite sides are parallel and have the same length.
Side length a=
Side length b=
Height h_a=


Side length a=
Side length b=
Height h_a=
Circumfirence U=2(a+b) =
Area A=a*h =
Diagonal 1 d_1  = \sqrt {a^2  + b^2  + 2*a*sqrt {b^2  - h_b^2 } } =
Diagonal 2 d_2  = \sqrt {a^2  + b^2 -2*a*sqrt {b^2  - h_b^2 } } =
Angle asin(A/(a*b)) =
Angle beta=pi-alpha =



Description at Wikipedia

deesParallelogram
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