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Linear Algebra

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Unit Vector: Identify Unit Vectors in R^2, Select All

LINALG-W3IGEI

Which of the following vectors are unit vectors?

Select ALL that apply.

A

$\begin{bmatrix} 0\\\ 0\end{bmatrix}$

B

$\begin{bmatrix} 10\\\ -9\end{bmatrix}$

C

$\begin{bmatrix} 1/2\\\ 1/2\end{bmatrix}$

D

$\begin{bmatrix} 1/\sqrt{2}\\\ 1/\sqrt{2}\end{bmatrix}$

E

$\begin{bmatrix} \sqrt{3}/2\\\ 1/2\end{bmatrix}$

F

$\begin{bmatrix} 1/\sqrt{2}\\\ 0\end{bmatrix}$