Final answer:
Without additional information about the quadrilateral ABCD, it is not possible to calculate the length of the side CD. Geometry problems require precise measurements and properties to solve for unknown lengths or angles.
Step-by-step explanation:
The question is asking for the length of the side CD of a quadrilateral ABCD. To solve this, we may need additional information such as the length of the other sides, or if ABCD has any special properties like being a rectangle or parallelogram. For example, in a rectangle, opposite sides are equal, so if AB is known, then CD = AB. However, since the information given is not sufficient to calculate the length of CD, we cannot provide an exact answer. In geometry, precise measurements and properties are essential to determine lengths and angles with respect to other sides and angles within shapes.