Answer:
4.5 cm
Step-by-step explanation:
Given that segment RS = 2.0 cm, and segment ST = 2.5 cm, since point R, point S, and point T are collinear, therefore, based on segment addition postulate:
RS + ST = RT
2.0 cm + 2.5 cm = RT (Substitution)
4.5 cm = RT
RT = 4.5 cm.
Thus, the measure of segment RT given above is 4.5 cm.
