Answer:
Step-by-step explanation:
The formula you want is x°=(major arc - minor arc)
If the minor arc is 90, and all the way around the outside of a circle is 360 degrees, that means that the major arc measures 360 - 90 = 270. Filling in our formula:
x°=(270 - 90)
or
x° = (180)
That gives us that x is a right angle at 90°