A cup of 10 cm height and 5 cm diameter is to be made from

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A cup of 10 cm height and 5 cm diameter is to be made from a sheet metal of 2 mm thickness. The number of deductions necessary will be

1. One
2. Two
3. Three
4. Four

Correct Option: C

D = √d² + 4hd = √5² + 4 × 5 × 10 = 15 cm
first reduction 50%
Next reduction 30%