Answer to Question #78762 in Analytic Geometry for Satyabrat

Question #78762

ax^2+by^2+cz^2=d represents a sphere with radius √(a^2+b^2+c^2-d) where
a,b,c,d are positive real numbers.
Is the statement true? Give reason for your answers either with a
short proof or a counterexample.

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