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because they are the same shape
Area = length*perpendicular height or 0.5*the product of its diagonals
If you want to ask questions about "this formula", may I suggest that you ensure that there is "this formula" in the question?
The formula for the surface area of a sphere is: 4 pi r 2
It depends on the formula that describes the surface itself. "Curved surface area" is not enough information to answer the question.