What is a supplementary adjacent angle formed by two intersecting angles?

Answer 1

........................Point D

.........................../

.........angle BED / angle AED

Point B -----------E------------- Point A

.......angle BEC / angle AEC

......................./

..................Point C

Assuming you mean: ...formed by intersecting lines, then this is what it means:

Line DC intersects line AB at point E, Splitting Angle AEB into separate angles. Angle AEB is 180o. When you add the angles of BEC and AEC, they total 180o. The same works with any two adjacent angles - angles that are next to each other. Two angles that form 180o when added are called supplementary Therefor, angles BEC and AEC are Supplementary and adjacent

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