Question

how to prove it.......​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

From triangles DML and BMN,

Angle LDM = Angle BNM(DC||AB and DB is the transversal)

DM = MB ( diagonals of parallelogram bisect each other)

angle DML = angle BMN( Vertically Opposite Angles)

By S-A-S criterion, the triangles are congruent.

By CPCT, LM = ON

Therefore, M is the midpoint of LN.

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