SOLUTION: How do you find the surface area of a border around a circle. Do you use the same formula as the surface are for a circle? 3.14 x Radius squared? An example would be ... you have a

Question 596553: How do you find the surface area of a border around a circle. Do you use the same formula as the surface are for a circle? 3.14 x Radius squared? An example would be ... you have a circle with a border that goes all around the circle and is 1ft away from it...
Thanks, Victor
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
How do you find the surface area of a border around a circle. Do you use the same formula as the surface are for a circle? 3.14 x Radius squared? An example would be ... you have a circle with a border that goes all around the circle and is 1ft away from it...
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The area (I don't know why you call it surface area) is the area of the outside circle minus the area of the inside circle.
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If the difference is 1 inch radius, it's
where r is the radius of the inside circle.

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