State the principal definition or theorem that enables you to deduce or prove, from the information given,that quadrilateral PQRS is a parrallelogram.
PQ=SR;PQ||SR

PQ||SR;PS||QR

Question

State the principal definition or theorem that enables you to deduce or prove, from the information given,that quadrilateral PQRS is a parrallelogram.
PQ=SR;PQ||SR

PQ||SR;PS||QR

<PSR=RQP;<SRQ=QPS

PQ=SR;PS=QR

PA=1/2 PR;SA=1/2 SQ

directrix · Answer

@ze4life  Please provide the diagram and instructions. This looks as if it might be a question about various quadrilaterals.

anonymous · Answer

What exactly is the end result you are trying to deduce or prov, of the statements given?

anonymous · Answer

|dw:1359763252515:dw|

directrix · Answer

The attached chart displays the theorems used to prove that a quadrilateral is a parallelogram. Please review them.

directrix · Answer

@ze4life  I'll help you get started by working the first two problems.
------------
7) If one pair of opposite sides of a quadrilateral are both congruent and parallel, the quadrilateral is a parallelogram. 

|dw:1359783930539:dw|