# ABCDE.is pentagon prove that vector AB+ vector BC+vector CD +vector DE+vector EA=0

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- ... is a
**pentagon**.**Prove**that sum of**vectors****AB**+**BC**+**CD**+**DE**+**EA**=0 - ...
**ABCDE**has a right angle at B,**AB**=**BC**and**CD**=**DE**=**EA**... - ... BD =2
**vector****BC**and**vector**AC -**vector**BD = 2**vector****AB** - ... ,
**AB**=**vector**a and**BC**=**vector**b, then express**CD**,**DE**, EF ... - ... b --
**vector****AB**and**vector**AC or**vector****AB**and**vector****BC**?