The area is the inside. The perimiter is around. If its a rectangle, to find the area you multiply the lengths of two sides
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It is not. If you draw yourself a square then inscribe a circle with a radius of half the length of a side of the square, the circle will fit inside the square but the corners of the square will be outside the circle. Thus by inspection the area of the square is larger than the area of the circle.
area is inside the shape/figure
Yes hemorrhoids can be on the inside or outside of the anal area.
Inside area: pi1.51 square inches
If your ring has an outer radius of 8 mm and an inner one of 5 mm, you will have pi times (routside)2 minus pi times (rinside)2 or about 122.522 square millimeters of area on the top of the ring. Double that if you add in the surface area of the bottom. As to the sides (the inside and outside), we cannot calculate them without a thickness.