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Rhombus is a parallelogram with four congruent sides.
10
We want to find FG. Let's review the definition of a rhombus.
A rhombus is a parallelogram with four congruent sides.
Let's draw the graph with that information.
Therefore the sides DF and FG are congruent. It means they have the same lengths. We are given that DF=10. Therefore FG=10.