Final answer:
The length of the missing side in a parallelogram is equal to the length of the side directly opposite to it. If one side is 7.7 units and the other is 2 units, the missing sides will be 7.7 units and 2 units, respectively.
Step-by-step explanation:
The question concerns determining the length of a missing side in a parallelogram. In a parallelogram, opposite sides are equal in length. This means that to find the length of the missing side labeled with a '?', one must look at the side directly opposite to it, which has its length given.
For example, in the provided context, if the side TR is 7.7 units long, and TR is opposite to side QS, then the length of QS would also be 7.7 units, since QS = TR. Similarly, if one side is labeled as 2 units and you are asked to find the missing side that it is parallel to, that missing side would also measure 2 units in length because both are sides of the same parallelogram.
Overall, the length of the missing side '?' will be equal to the length of the side directly opposite to it in the parallelogram.