Show that, if `x^2 + y^2 = 1`, then the point `(x, y, sqrt( 1 - x^2 - y^2) )` is at a distance `1` unit form the origi

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Q 1769167015.     Show that, if `x^2 + y^2 = 1`, then the point `(x, y, sqrt( 1 - x^2 - y^2) )` is at a
distance `1` unit form the origin.

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