# Chapter 8 - 8.4 - Vectors and Dot Products - 8.4 Exercises - Page 596: 55

Not orthogonal

#### Work Step by Step

We know that $\langle u_1,u_2 \rangle \cdot \langle v_1,v_2\rangle$ is equal to $u_1v_1 +u_2v_2$. Thus, we find that the dot product of these two vectors is: $$(1)(-2)+(0)(2)=-2$$ The dot product is not zero, so the vectors are not orthogonal.

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