How to select 3D elements by path?

In the first image, the purple elements are 3D. I need to select one row along the circumference. I tried elements by path. It is not working. Can someone please help me?

In the second image. the outer layer of the hemisphere is made of 3D elements. I need to select all the elements on the top face of the hemisphere. Which option is the best way to do it?
Thanks in advance for your insights and help!