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Question

L and M are the mid-points of sides AB and DC respectively of parallelogram ABCD. Prove that segments DL and BM trisect diagonal AC.

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Solution

The required figure is shown
From figure,
BL=DM and BLDM and BLMD is a parallelogram, therefore BMDL
From triangle ABY
L is the midpoint of AB and XYBY, therefore x is the midpoint of AY .ie AX=XY ..........(1)
Similarly for triangle CDX
CY=XY ......(2)
From (1) and (2)
AX=XY=CY and AC+XY+CY
Hence proved
1799228_1284936_ans_5cc5b46ecdd6403f938dbc1c98fcd26c.png

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