Axioms are assumed

Which of the following is a true statement?

A point $C$ is called the midpoint of a line segment $\overline{AB}$ if

A point $C$ is said to lie between the points $A$ and $B$ if

Euclid's which axiom illustrates the statement that when $x+y=15$, then $x+y+z=15+z$?

$\mathrm{A}$ is of the same age as $\mathrm{B}$ and $\mathrm{C}$ is of the same age as $\mathrm{B}$. Euclid's which axiom illustrates the relative ages of $\mathrm{A}$ and $\mathrm{C}$?