ABCD is a parallelogram, E is the midpoint of AB and F is the mid-point of CD. PQ is any line that intersects AD, EF and BC at P, G and Q. Prove that PG = GQ.
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Answer:
AE=BE=
2
1
AB and CF=DF=
2
1
CD
But, AB=CD
∴
2
1
AB=
2
1
CD⇒BE=CF
Also, BE∥CF [∵AB∥CD]
∴ BEFC is a parallelogram.
⇒BC∥EF and BE=PH ...(i)
Now, BC∥EF
⇒AD∥EF [∵BC∥AD as ABCD is a ∥
gm
]
⇒AEFD is a parallelogram
⇒AE=GP ...(ii)
But, E is the mid-point of AB.
∴AE=BE
⇒GP=PH [Using (i) and (ii)]
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