Respuesta :

LokiCat99
Answer: 100 degrees
Since it is supplementary, it equals 180 degrees. If you take 180 and subtract 80 from it, you will get your answer

Answer:

100°

Step-by-step explanation:

Supplementary angles equal 180° when added together.  

subtract 80° (angle A) from 180° (total sum of angles) and you get 100° (angle B)

hope this helps :)