cylindrical coordinates are : right?

spherical coordinates are: right?

so in your second question the r = 3, theta = pi/4 and z = 2

r and theta are on the xy plane. You're looking at a point that has a radius 3 and an angle of 45 degrees measured from the x axis. So that's roughly on the x-y plane. Then your Z is your height.

So you just have a point 2 spaces above that.

About your first question if you could be a little clearer, it seems like it should also be cylindrical but you named the thread as "spherical" coordinates.