ENTERPRISES THAT HAVE PASSED QUALITY SYSTEMCERTIFICATION
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Online calculator for circular volume and surface area

Outer radius：
Inner radius：
volume：
surface area：

Circular volume formula：
   V = π2 * (R + r) * (R - r)2

Formula for circular area：
   S = π2 * (R2 - r2)

Here
   R：Outer radius
   r：Inner radius