### Home > PC3 > Chapter 8 > Lesson 8.2.2 > Problem8-80

8-80.

Calculate the angle between each pair of vectors below.

1. $\langle - 6,3 \rangle$ and $\langle 2,4 \rangle$

$−6 · 2 + 3 · 4$

1. $3 \mathbf{\text{i}} + 4 \mathbf{\text{j}}$ and $- 2 \mathbf{\text{j}}$

These vectors are $⟨3, 4⟩$ and $⟨0, −2⟩$.