Vector has magnitude and is directed above the positive -axis

MATHEMATICS · Single correct · A Level · Mathematics · Vectors · Vectors

Problem

Vector R⃗\vec R has magnitude 4 units4\,\text{units} and is directed 60∘60^\circ above the positive xx-axis. Vector S⃗\vec S has magnitude 7 units7\,\text{units} and is directed 150∘150^\circ from the same axis. Determine the angle between R⃗\vec R and S⃗\vec S. (a) 30∘30^\circ (b) 120∘120^\circ (c) 90∘90^\circ (d) 60∘60^\circ

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