What_is_the_formula_for_the_area_of_the_ring?

• A. area of the ring = depth of the end ring + thickness of the end ring
• B. area of the ring = depth of the end ring ‚Äö√Ñ√∂‚àö√ë‚àö¬® thickness of the end ring
• C. area of the ring = depth of the end ring / thickness of the end ring
• D. area of the ring = depth of the end ring * thickness of the end ring