Question

the angle between 3j + 4k and 2i​

Answer 1

Answer:

90°

Explanation:

since 3j + 4k lie on YZ plane & 2i lies on X axis

Answer 2

⏩Hey mate ❤

let

a= 3j + 4k

and,

b= 2i

so,

we know ,angle between will be

a.b = |a|.|b| cos x. .....(1)

So,

where x, angle between a and b

so,

|a|= √{3²+4²}

= √(9+16)

=√(25)

= 5

and,

|b| = √(2²)

=2

so,by (1)

=>(2j+4k)(2i)=5×2 cos x

=>0 = 10 cos x

=>cos x= 0

=>cos x = cosπ/2

so,

x= π/2

Thus:--

Angle of between a and b will be

= π/2

⏩Hopes its help's u

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