Question

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The angle between the vectors a = 2î+2j – and b = 3i – 4j is
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Answer 1

Answer:

Explanation: We know that A.B=|A| |B| cos x

so, cosx= |A| |B|/ A.B

|A| = √2²+2²=2√2

|B| = √3²+4²=5

A.B = 6-8= -2

So, cosx = 10√2/-2 = -5√2

x = cos^-1 ( -5√2 )