Question

if P and Q vectors manitude one 5 and 8 they making an angle 60 then PQ=​

Answer 1

Answer:

(129)^0.5

Explanation:

R^2 = a^2 + b^2 + 2*a*b*costhetha

R^2 = 5^2 + 8^2 + 2*5*8*1/2

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R^2 = 25 + 64 + 80/2

R^2 = 25 + 64 + 40 => 65 + 64 => 129

R = square root of 129 => (129)^1/2