List of top Mathematics Questions on introduction to three dimensional geometry asked in MET

The graph of equation \(y^2 + z^2 = 0\) in three dimensional space is
The radius of the sphere $x^2 + y^2 + z^2 = 12x + 4y + 3z$ is
The perimeter of the triangle with vertices at (1, 0, 0), (0, 1, 0) and (0, 0, 1) is