Question

Find angle between the vector's
a = i+j+k,b = -21-25-2k​

Answer 1

Answer:

Given :

A

=

i

^

+2

j

^

−

k

^

B

=−

i

^

+

j

^

−2

k

^

A

.

B

=−1+2+2=3

∣

A

∣=

1

1

+2

2

+1

2

=

6

∣

B

∣=

1

1

+1

2

+2

2

=

6

⟹ cosθ=

∣

A

∣∣

B

∣

A

.

B

Or cosθ=

6

×

6

3

=

2

1

⟹ θ=60

o

Explanation:

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