Question

given that vector sum of P and Q is vector R and that R is perpendicular to P . If magnitude of vector of P = magnitude of vector of R then what is the angle between P and Q

Answer 1

Answer:

135° is the answer

that's it

Answer 2

Answer:

the required angle between P ans Q is  135

Explanation:

Given :vector P + vector Q = R

R is ⊥ to P

magnitude of vector P = magnitude of vector R

find the angle between P and Q :

let the angle between Q and R is Ф

Q cos Ф = R     --(1)

Q sin Ф = P        ---(2)

divide 2 by 1  

tan Ф = Q sin Ф / Q cos Ф = P/R = 1

tan Ф = 1

Ф = 45

so , the required angle between P ans Q is  

45 + 90 = 135