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In Parallelogram LMNO, LM = 4.12, MN = 4, LN = 5, And OM = 6.4. Diagonals And Intersect At Point R. What Is The Length Of ? - Math Discussion

In parallelogram LMNO, LM = 4.12, MN = 4, LN = 5, and OM = 6.4. Diagonals and intersect at point R. What is the length of ?