A shell of 100 mm diameter and 100 mm height with the corner

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A shell of 100 mm diameter and 100 mm height with the corner radius of 0.4 mm is to be produced by cup drawing. The required blank diameter is

1. 118 mm
2. 161 mm
3. 224 mm
4. 312 mm

Correct Option: C

D = √d² + 4hd
D = √100² + 4 × 400 × 100
D = 224 mm