Question

plz help me and Don't scam one or more option can be correct​

Answer 1

Answer:

Since all vectors are equal in magnitude,

A + B + C + D = 0

A + B + C = - D

First option is correct.

Since A is perpendicular to B and D both,

A.B = 0  ;   A.D=0

[NOTE : Dot product follows commutative law, which means A.B = B.A = 0]

So A.B = A.D

Third option is correct.

( B + C ) . A = B.A + C.A

= C.A   [ we know A.B = B.A = 0 because angle between them is 90 degrees. ]

= C A  (cos 180)

= - C A < 0

Forth option is correct.

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