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If a sphere of radius r divided 8 equal part find the total surface area.
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You did not provide the description on how the sphere was divided in 8 equal parts.
Probably, it was made by using four planes that all contain the common diameter of the sphere.
Then the total area of these 8 pieces is equal to the surface area of the sphere plus the area of 8 semi-circles
of the same radius, i.e.
+ = .
It is doubled area of the surface area of the sphere.
