I have made a hollow tube (thickness $1$mm) having inner radius $89$ mm and outer radius $90$ mm (length $400$ mm, can be higher). then I made a circular (circle radius $25$ mm) cut perpendicular to tube Length. Now I want to calculate area (from extracted circle of $25$ mm radius) for a radius of $13$ mm from center. Just think in steps: 1. cut a tube from diameter. 2. take any one part of tube 3. now apply above given dimensions 4. you will get a curved Circle.
How Can I calculate radius?
How the area will be calculated as it will be half symmetry. ( I have image but it is saying i need at least 10 reputation to upload image.. i can send if some body need via email.