An ant is crawling along a straight wire, which we shall call the $x$ axis, from $A$ to $B$ to $C$ to $D($which overlaps $A),$ as shown in the figure below: $($Figure $1)O$ is the origin. Suppose you take measurements and find that $AB$ is $45cm,BC$ is $21$ cm $,$ and $AO$ is $3$ cm $.$Figure

$1$ of $1$

Whats the ants position at point A$,$B$,$C$,$ and D