23 Maths -- Vectors

If | a"| = |b"| =|a"+b"| is given, Find |a'' - b''| [here " means vector 'Can you please tell me the concept behind this question?

If | a"| = |b"| =|a"+b"| is given, Find |a'' - b''|

[here " means vector '

Can you please tell me the concept behind this question?

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If A,B,C and D are any four points so that,vector AB.CD + vector BC.AD + vector CA.BD=0.