Interactive Map with Radius Circle for Travel

Hi all,

My client would like to add an interactive map with a radius circle shown on the map so that she can clearly demonstrate where she will travel to. If clients arent within that radius she will need to charge for travel. Is there an easy way to do this? I've been looking into google maps but there doesnt seem to be a straightforward solution. 

Hi,

Do you know an example/mockup? We can imagine easier