what is the angle between (i+j) and (k+j)?

Asked by pehu kohli | 16th Jun, 2011, 12:00: AM

Expert Answer:

let vector a = i^ + j^
and vector b = k^ + j^
 
Let the angle between a and b is ?, then
 
a.b = a b cos?
 
(i^ + j^).(k^ + j^) = sqrt(1+1)sqrt(1+1) cos?
 
0 + 0 + 0 + 1 = 2 cos ?
 
cos? = 1/2
 
? = 600

Answered by  | 16th Jun, 2011, 04:41: PM

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