Question

If a + 5) - - 6)
, what is the angle between a and 5 ?​

Answer 1

Answer:

Correct option is

E

6

Given, angle between

a

and

b

is

6

5π

and

∣

∣

∣

∣

b

∣

∣

∣

∣

a

.

b

=

3

−9

[∵

a

.

b

=∣

a

∣

∣

∣

∣

∣

b

∣

∣

∣

∣

cosθ]

⇒∣

a

∣cosθ=

3

−9

⇒∣

a

∣×cos

6

5π

=

3

−9

⇒∣

a

∣=6