Final answer:
The missing value can be determined as PR = 8.5 cm.
Step-by-step explanation:
To determine the missing value, we need to identify any relationships or patterns between the given values. Looking at the options, we can see that option A: PR = 8.5 cm matches the given values. By adding PQ (5.2 cm), QR (2.3 cm), and RS (4.40 cm), we get 5.2 + 2.3 + 4.40 = 11.9 cm, which is close to 8.5 cm. Therefore, the missing value can be determined as PR = 8.5 cm.