To determine the length of CE based on the information given (AB = 9 units and BC = 12 units), we need more context. Specifically, we need to know how points A, B, C, and E are related or positioned in relation to each other.
If A, B, C, and E are points on a straight line (for example, A is to the left of B, B is to the left of C, and C is a point in the same line), then:
- The total length AC would be AB + BC = 9 + 12 = 21 units.
If E is located on AC, then we would need to know either the distance from A or the distance from C to calculate CE.
If you provide more context or relationships between the points, I can help you find the length of CE.