Answer:
Metaphor is iterary device is used in this quote, "Yet all experience is an arch wherethro' Gleams that untravell'd world whose margin fades For ever and forever when I move."
Explanation:
When something becomes something else to deepen understanding for the reader and bring extra imagery into play
More details so i can answer please
Are you talking about a triangle?
If so, the angles in a triangle add up to 180.
70 + 30 = 100
So c must be 80 because 100 + 80 = 180.
x = 80
You need to give more context. I will help when you do. God bless!