Question

it is found that for two vectors a vector and b vector. a vector. b vector = -ab what is the angel between a vector and b vector
​

Answer 1

Answer:

=

i

^

+2

j

^

+2

k

^

b

=

1

^

−2

j

^

+2

k

^

We know,

dot product,

a

.

b

=∣

a

∣

∣

∣

∣

∣

b

∣

∣

∣

∣

cosθ

⇒cosθ=

∣

a

∣

∣

∣

∣

∣

b

∣

∣

∣

∣

a

.

b

⟶(1)

a

.

b

=1−4+4=1

∣

a

∣=

1

2

+2

2

+2

2

=3

∣

∣

∣

∣

b

∣

∣

∣

∣

=

1

2

+2

2

+2

2

=3

Using (1),

⇒cosθ=

3.3

1

=

9

1

⇒cosθ=

9

1

⇒θ=cos

−1

9

1

Step-by-step explanation:

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Answer 2

Answer:

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