Q. 114.1( 366 Votes )

In Δ ABC and Δ DEF, AB = DE, AB || DE, BC = EF and BC || EF. Vertices A, B and C are joined to vertices D, E and F respectively (see Fig. 8.22). Show that

(i) Quadrilateral ABED is a parallelogram

(ii) Quadrilateral BEFC is a parallelogram

(iii) AD || CF and AD = CF

(iv) Quadrilateral ACFD is a parallelogram

(v) AC = DF

(vi) Δ ABC Δ DEF.


Answer :

(i) Given that: AB = DE and

AB || DE

If two opposite sides of a quadrilateral are equal and parallel to each other, then it will be a parallelogram.

Therefore, quadrilateral ABED is a parallelogram


(ii) Again,


BC = EF and BC || EF

Therefore, quadrilateral BCEF is a parallelogram


(iii) As we had observed that ABED and BEFC are parallelograms


Therefore,


AD = BE and AD || BE


(Opposite sides of a parallelogram are equal and parallel)


And,


BE = CF and BE || CF


(Opposite sides of a parallelogram are equal and parallel)


AD = CF and AD || CF


(iv) As we had observed that one pair of opposite sides (AD and CF) of quadrilateral


ACFD are equal and parallel to each other, therefore, it is a parallelogram


(v) As ACFD is a parallelogram, therefore, the pair of opposite sides will be equal and parallel to each other


AC || DF and AC = DF


(vi) ΔABC and ΔDEF,


AB = DE (Given)

BC = EF (Given)

AC = DF (ACFD is a parallelogram)


ΔABC ΔDEF (By SSS congruence rule)

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