Is there a way to plot cities on a map and apply either one of the following:

1) A static radius, for example, Dallas with 200 mile radius semi-transparent swept out circle around it.

or

2) Same as above and then maybe use a parameter to allow user input to the mile-radius of the circle.

See a Tableau-PPT combo example attached.  I'd like to do this all in Tableau to take advantage of interactive filters, on the fly variable radius..etc.

thx..