theta $=0\mathrm{.}5024$

$particl{e}_p$osition $=$ vector $(1*,1*,)$

obslocation$=$vector $(cos($ theta $),sin($ theta $),)$

$r=$ obslocation$-particl{e}_p$osition

$r$ rmag$=sqrt(r*x^{****}2+r*y****2+r*z^{****}2)$

rhat$=\frac{r}{r}$mag

Check all of the variables that are vectors:

False: theta

False: rmag

True: $r$

True: particle$\_$position

True: obslocation

True: rhat

You are correct.

Your receipt no$.$ is $158-8347(?)$ Previous Tries

$($c$.)$ What is the length of the vector $r?$

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