How to scale two objects to fit together If I have a cylinder and a half-sphere, for example, like this:



Which is the best/quickest way to scale the half-sphere to match the size of the cylinder maintaining the shape of the half-sphere? So that when I bridge them together I get completely straight lines?

I've tried with snap during transform but I never get the correct resize or the half-sphere gets immense...
Assuming nothing is centered or aligned (but rotation is consistent), use Snapping >> Vertex >> Active.

1.) Select a bottom vertex with which to align the half-sphere. L to select connected vertices.

2.) Drag it over to snap it to its "sister" vertex.

3.) Reselect the vertex and Shift + S to move Cursor to Selected.  Change the Pivot Point to 3D Cursor.

4.) Now, select the opposite vertex (make active) and L to select connected vertices.

5.) Scale to "sister" vertex.