To find the length of CE, we need some additional information, such as a diagram or a description of the geometric configuration involving points A, B, C, and E. However, given the information provided:
- AB = 9 units
- BC = 12 units
One possible interpretation if points A, B, C, and E are on a straight line would be:
CE could be determined as follows assuming they are in a straight line from A to C, and E is an external point or part of the configuration.
If we assume C is between A and B, we would consider that:
\[ AC = AB + BC = 9 + 12 = 21 \text{ units} \]
If CE is a continuation of this line, then without any further details, we cannot pinpoint the length of CE.
Assuming E is such that AC and CE are collinear and E extends from point C in the same line, we would require additional information on how far E is from C.
If you can provide a specific geometric arrangement or any additional details, I can help you calculate or deduce the length of CE accurately.