The length of $CD$ to the nearest tenth is 10.3 units.

Would you like a detailed explanation or have any questions?

Here are 5 related questions you may find helpful:

1. How is the distance formula derived from the Pythagorean theorem?
2. How can you calculate the midpoint of a line segment in a coordinate plane?
3. What are the properties of horizontal and vertical distances in the coordinate plane?
4. How do you find the length of a diagonal in a rectangle using the distance formula?
5. What are the steps to solving multi-step problems involving distance in geometry?

Tip: Always double-check the coordinates of points before applying the distance formula to ensure accuracy!