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If |a+b|=|a| then find angle between |2a+b| and |b|.

Biswajeet Behera , 6 Years ago
Grade 9
anser 1 Answers
Aditya Gupta

Last Activity: 6 Years ago

|a+b|=|a|
square both sides,
a^2+b^2+2a.b=a^2
or b.(b+2a)=0
here a.b means the dot product.
so the angle between b and 2a+b is pi/2.

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