Raluca98task
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     Sa se demonstreze ca in patrulaterul MNPQ are loc relatia : vectorul MN + vectorul PQ = vectorul MQ + vectorul PN.

Răspuns :

Miky93ask
MN+PQ=MQ+PN  

=>MN-MQ=PN-PQ (1)

MN-MQ=QN (2)
PN-PQ=QN (3)

(2)=(3)=QN
(1)=QN
MN-MQ=PN-PQ =QN   =>MN+PQ=MQ+PN   (c.t.t.d.)

OBS: 'XY' = vector

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