Two vectors each of magnitude are inclined at an angle

MATHEMATICS · Single correct · AP · AP Precalculus · Functions with Parameters, Vectors, and Matrices · Functions with Parameters, Vectors, and Matrices

Problem

Two vectors each of magnitude 10 units10\,\text{units} are inclined at an angle θ\theta. For which value of θ\theta (in degrees) will the magnitude of the resultant also be 10 units10\,\text{units}? (a) 60∘60^{\circ} (b) 90∘90^{\circ} (c) 120∘120^{\circ} (d) 150∘150^{\circ}

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