Quadrilateral having both pairs of opposite sides equal means Parallelogram (Theorem and Proof)

Friends,

This is a Math video. This is our sixth webisode (WB-6) on "Series 8 -- Quadrilaterals".
In this video, we learn that if a quadrilateral has both pairs of opposite sides equal then that quadrilateral is a parallelogram.

Then we go ahead and prove this theorem.

This video is suited for class-9 (Class-IX) or grade-9 kids.
Cheers,
Friends at Rising Pearl

[dostotussigreatho]

Hi Shanon,
Glad you liked the video!
Cheers,

[shanonchris]

tnx rising pearl because of u guys i got 2 learn soming in last night

[luvmusikkk]

pls post video abt Rhombus theorem. I found your video very useful

[decentgamer]

Thank you for the video. It helped a lot.

[amanathshortsyt]

I can't find the webisode 4 and 5 can you plz help me finding that

[ChannelMath]

you assume the quadrilateral is convex, relying on the diagram. But opposite sides can be equal in an antiparallelogram also.
This is how grade school geometry is taught, so no criticism, but this doesn't quite qualify as a mathematical proof

[jayeshmhaske]

sir you are explaining wrong sir you also know that alternate interior angles are formed only when the two lines are parallel so how can you say that angle cab = angle acb

[jayeshmhaske]

no no no i am very sorry sir it"s my mistake that by mistake i forgot that firstly you proved that the two triangles are equal by sss congruency