Area of Parallelogram in Terms of Its Diagonals

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The area of a parallelogram (shown in blue) with sides
and
is
. This Demonstration shows that double the area is
, where
and
are the diagonals. So the area of a parallelogram can be expressed in terms of its diagonals
and
as well as its sides.
Contributed by: Izidor Hafner (January 2016)
Open content licensed under CC BY-NC-SA
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"Area of Parallelogram in Terms of Its Diagonals"
http://demonstrations.wolfram.com/AreaOfParallelogramInTermsOfItsDiagonals/
Wolfram Demonstrations Project
Published: January 15 2016