360/360 = 100%
A fraction like 360/360 represents a complete amount, so it equals 100%. You might see this when a phone battery is fully charged, a task is completely finished, or every student in a group turns in an assignment.
It is easy to picture as one whole circle, a full glass, or a progress bar filled from beginning to end. Since the numerator and denominator are the same, you can quickly estimate that the value is complete rather than only part of the total.
A common mistake is thinking that a large number like 360 makes the fraction greater than 100%. The numbers describe equal parts of the same whole, so having all 360 parts means the entire amount, not more than the entire amount.