A hemispherical cup of radius R is formed in a press working

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A hemispherical cup of radius R is formed in a press working operation. The radius of blank would be

1. √2R
2. √3R
3. √(2 / 3)R
4. √(3 / 2)R

Correct Option: A

Area of Blank = surface area of cup

πR²_b	4πR²
	2

R_b = √2R