When a solid sphere is cut in two equal pieces, two plane surfaces will be created along with the curved surface. The old surface area will be 4π2 and the new surface area will be 6π2. Hence the area will be increased by 150%.
Question : A solid sphere of diameter 7 cm is cut into two equal halves. What will be the increase in its total surface area?
Option 1: 77 cm2
Option 2: 60.5 cm2
Option 3: 65.5 cm2
Option 4: 55 cm2
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