x^2 - 2ax + a^2 + y^2 - 2ay + a^2 + z^2 = 2a^2 \quad \Rightarrow \quad 2a^2 - 2ax - 2ay + 2a^2 = 2a^2 \quad \Rightarrow \quad 2a^2 - 2ax - 2ay + 2a^2 - 2a^2 = 0 \quad \Rightarrow \quad ax + ay = a^2 \quad \Rightarrow \quad x + y = a

Fri, 01 May 2026 08:50:52 +0000

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