Three vectors vec(P), vec(Q), vec(R) obey vec(P) + vec(Q) = vec(R) and P^(2) + Q^(2) = R^(2) the angle between vec(P) & vec(Q) is

Three vectors vec(P), vec(Q), vec(R) obey vec(P) + vec(Q) = vec(R) and

1.	Three vectors vec(P), vec(Q), vec(R) obey vec(P) + vec(Q) = vec(R) and P^(2) + Q^(2) = R^(2) the angle between vec(P) & vec(Q) is
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