Exact values for coordinates and angles

Hi,

when i construct a model in blender, i’d like to
put objects like spheres and boxes at exact values
in space, like:
put a sphere to 8, 5.5, 3, diameter 6.6

I’d also like to put some points of a mesh to
exact values.

How can i do that?

Best regards,
Torsten.

select the vertex and press the NKey.

Martin