Given vectors u = ⟨–2, 3⟩ and v = ⟨–6, 9⟩, what is the measure of the angle between u and v?

Since 3⟨–2, 3⟩ = ⟨–6, 9⟩, vector v is a positive multiple of vector u. The vectors point in the same direction, so the angle between them is 0°. The correct choice is A, 0°.

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