This is not very definitive;
narrow circular ring: washer? wedding band make of circular wire? flat circular ring made of horizontal flat stock rolled in a circle?
narrow circular ring: washer? wedding band make of circular wire? flat circular ring made of horizontal flat stock rolled in a circle?
https://www.youtube.com/watch?v=tMVwXglUp60
Let's call the radius of the larger circle R and the radius of the smaller circle r. The area of the narrow circular ring can be found by subtracting the area of the smaller circle from the area of the larger circle.
The formula to find the area of a circle is A = πr^2, where A is the area and r is the radius. Using this formula, the area of the larger circle is A1 = πR^2 and the area of the smaller circle is A2 = πr^2.
To find the area of the narrow circular ring, we can subtract A2 from A1:
Area of the ring = A1 - A2
= πR^2 - πr^2
= π(R^2 - r^2)
So, the appropriate formula for the area of a narrow circular ring is π(R^2 - r^2).