In $\Delta ABC$ and $\Delta DEF$,$AB = DE$,$AB \parallel DE$,$BC = EF$ and $BC \parallel EF$. Vertices $A, B$ and $C$ are joined to vertices $D, E$ and $F$ respectively (see Fig). Show that $AC = DF$.

Vedclass pdf generator app on play store
Vedclass iOS app on app store
(N/A) Given: $AB = DE$,$AB \parallel DE$,$BC = EF$,and $BC \parallel EF$.
Step $1$: Consider quadrilateral $ABED$. Since $AB = DE$ and $AB \parallel DE$,one pair of opposite sides is equal and parallel. Therefore,$ABED$ is a parallelogram.
Step $2$: Since $ABED$ is a parallelogram,$AD = BE$ and $AD \parallel BE$.
Step $3$: Consider quadrilateral $BCFE$. Since $BC = EF$ and $BC \parallel EF$,one pair of opposite sides is equal and parallel. Therefore,$BCFE$ is a parallelogram.
Step $4$: Since $BCFE$ is a parallelogram,$BE = CF$ and $BE \parallel CF$.
Step $5$: From Step $2$ and Step $4$,we have $AD = BE$ and $BE = CF$,which implies $AD = CF$. Also,$AD \parallel BE$ and $BE \parallel CF$,which implies $AD \parallel CF$.
Step $6$: In quadrilateral $ACFD$,since $AD = CF$ and $AD \parallel CF$,it is a parallelogram.
Step $7$: Since $ACFD$ is a parallelogram,its opposite sides are equal. Therefore,$AC = DF$.

Explore More

Similar Questions

In parallelogram $PQRS$,diagonal $PR$ bisects $\angle P$. Prove that diagonal $PR$ bisects $\angle R$ also and $PQRS$ is a rhombus.

$ABCD$ is a parallelogram and $P$ and $Q$ are points on the diagonal $AC$ such that $AP = PQ = QC$. Prove that $BQ \parallel DP$ and $BD$ bisects $PQ$.

Diagonals $AC$ and $BD$ of a parallelogram $ABCD$ intersect each other at $O$. If $OA = 3\, cm$ and $OD = 2\, cm$,determine the lengths of $AC$ and $BD$.

$ABCD$ is a rectangle in which diagonal $AC$ bisects $\angle A$ as well as $\angle C$. Show that $ABCD$ is a square.

$ABCD$ is a parallelogram and $AP$ and $CQ$ are perpendiculars from vertices $A$ and $C$ on diagonal $BD$ (see figure). Show that $AP = CQ$.

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo