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Question 5
In a parallelogram ABCD, E and F are the mid-points of sides AB and CD respectively (see the given figure). Show that the line segments AF and EC trisect the diagonal BD.

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Solution

Given: ABCD is a parallelogram and E, F are the mid-points of sides AB and CD respectively
To Prove: Line segments AF and EC trisect the diagonal BD.
Proof: Since ABCD is a parallelogram.
AB || DC
And AB = DC (Opposite sides of a parallelogram)
AE || FC and 12 AB = 12 DC
AE || FC and AE = FC
AECF is a parallelogram
AF || EC
EQ || AP and FP || CQ
In Δ BAP, E is the mid-point of AB and EQ || AP, so Q is the mid - point of BP.
(By converse of mid-point theorem)
BQ = OQ ........(i)
Again, in Δ DQC,F is the mid-point of DC and FP || CQ, so P is the mid - point of DQ.
(By converse of mid-point theorem)
QP=DP ….(ii)
From Equations (i) and (ii) , we get
BQ = PQ = PD
Hence, CE and AF trisect the diagonal BD.

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