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Question

In the adjacent figure, ABCD is a parallelogram and line segments AE and CF bisect the angles A and C respectively. Show that AE||CF.

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Solution

Refer to the figure of the book.

A=C opposite angles of a parallelogram are equal12A=12C=>EAD=FCB (AE and CF bisect the angles A and C, respectively) In ADE and CBF:B=D opposite angles of a parallelogram are equalEAD=FCB (proved above) AD=BC opposite sides of a parallelogram are equalBy AAS concruency criteria: ADEBCFDE=BF (corresponding parts of congruent triangles)CD=AB opposite sides of a parallelogram are equal Also, CD-DE=AB-BFCE=AFABCD is a paralleleogram. CDAB (opposite sides of a parallelogram are parallel)=>CE AF If one pair of sides of a quadrilateral is parallel and equal, then it is a parallelogram.Therefore, AECF is a parallelogram. AECF

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