[ Measurement of segment lengths and angle measures. Adjacent angles.]

On a line, three points $A, B$, and $C$ are chosen, such that $A B=3, B C=5$. What can $A C$ be equal to?
Consider two cases.

## Solution

If point $B$ is located between points $A$ and $C$, then $A C=A B+B C=3+5=8$.

If point $B$ is located outside the segment $A C$, then $A C=B C-A B=5-3=2$.

## Answer

8 or 2.