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Show that the area of a rhombus is half ...

Show that the area of a rhombus is half the product of the lengths of its diagonals. GIVEN : A rhombus `A B C D` whose diagonals `A C` and `B D` intersect at `Odot` TO PROVE : `a r(r hom b u sA B C D)=1/2(A CxB D)`

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