which angles are supplementary to each other?

Step-by-step explanation:
[tex] \angle CED \: and \: \angle DEA [/tex] are Supplementary, because they form linear pair angle.
Answer:
<CED and <DEA
Step-by-step explanation:
<CEA is a straight angle and the sum of <CED and <DEA gives 180° therefore <CED and <DEA are supplementary.