The non-zero vectors vector a, vector b and vector c are related by vector a = 8vector b and vector c = - 7vector b.

Monjur Alahi

The non-zero vectors vector a, vector b and vector c are related by vector a = 8vector b and vector c = - 7vector b. Then the angle between vector a and vector c is

(a) π 

(b) 0 

(c) π/4

(d) π/2
 


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Salim Ahmed Kawsar

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(a) : vector a = 8vector b
vector c = - 7vector b
vector a and vector b are parallel and vector b and vector c are antiparallel.
Thus vector a and vector c are antiparallel.
Hence the angle between vector a and vector c is π.

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