The initial blank diameter required to form a cylindrical cup of outside diameter 'd' and total height'h' having a corner radius 'r' is obtained using the formula
- A. $D = \sqrt{d² + 4dh - 0.5r}$
- B. $D = \sqrt{d² + 2h^2 + 2r}$
- C. $D = d² + 2h^2 + 2r$
- D. $D = \sqrt{d² + 4dh - 0.5r}$
Answer: A. $D = \sqrt{d² + 4dh - 0.5r}$
Explanation: Standard formula for blank diameter with corner radius.