The radius of the sphere passing through the point `(alpha , beta , gamma )` and the circle `x^2 +y^2 =a^2 , z =0`

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Q 2187880787.     The radius of the sphere passing through the point

`(alpha , beta , gamma )` and the circle `x^2 +y^2 =a^2 , z =0` is

`(a^2 - alpha^2 - beta^2 - gamma^2)/r`
A True
B False

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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