Question

If a sphere of radius r is divided into four identical parts... then find the Total surface area of one part... of the four identical parts.. I know the answer but
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Answer 1

Step-by-step explanation:

Each of the four parts would now consist of four surfaces: a curved outer surface () , a curved inner surface () and two identical (isometric) flat surfaces ( & ) connecting thee inner and outer surface. Hence total surface area of all four parts is i.e. The diameter of a sphere is 7 m.

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