Question

1. If a=i-j+k and b = 3i+2j+2k find (i) a b
(ii) angle between a and b (iii) projection of a on
b and (iv) projection of b on a
​

Answer 1

Answer:

Step-by-step explanation:

Correct option is

A   π/4

C    3π/4

The diagonals are given by AB−BC=4i−2j+4k,AB+BC=2i−2j

These vectors have magnitudes 6 and 2 /2 respectively, and their dot product is 12.

Therefore the angle between them is cos  −1 12/(6) (2/2) = -1 1//2=4

/π

or π minus this value i.e.3π/4

hope this help you

stay home stay safe

https://www.toppr.com/ask/question/the-vectors-ab-3i-2j-2k-and-b-c-i-2k/

for more information