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Is there any problem in solving advanced mathematics? Do you think the eighth quadrant is below the first quadrant?
If there is a problem with the answer, the eighth gossip limit should be replaced by the fifth gossip limit.

The equation of the sphere of the first divination limit is ∑ 2: z = √ (1-x 2-y 2), and its projection area on the xoy plane is x 2+y 2 ≤ 1, x≥0, y≥0.

But in the eighth gossip limit, X is positive, Y is negative and Z is negative, so the spherical equation is ∑ 1: z =-√ (1-X 2-Y 2), and its projection area on the xoy plane is X 2+Y 2 ≤ 1, and x≥0, y.

These two projection areas are different.