Question

If A=3i+4j+5k

B=3i+4j-5k

Angle between A and B ?

Answer w/solution :)

Thanks.

On solving the question , the answer should come 90 degrees . As it is the correct one .

Answer 1

using dot product we can solve this problem easily...


=) remember that when dot product is zero then angle between the vector is 90°

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hope it will help u

Answer 2

"The dot product of A and B is zero. Therefore the angle between A and B is 90˚

Solution:

Given, A = 3i+uj+5k and B = 3i+uj-5k

By applying Dot product of A and B

A.B=0 Then A and B are at 90˚

Therefore = (3i+4j+5k) . (3i+4j-5k)

              = 9+16-25

              =0

Maths is always tricky when dealing with constants because it tends to change its value at any point of the process."