Calculating Distances?

Question

I am trying to establish Distances from one place to another in East Africa, Tanzania.

Here is a map to show the local areas
for e.g - whats the distance between Dar-es-Salaam (The capital) and Dodoma (The ex Captial)

However I need distances for most of the local area on the map below. Thanks for any help

http://en.wikipedia.org/wiki/Image:Tz-map.png

Answer 1

http://maps.google.co.uk/maps

Answer 2

go to Microsoft encarta

Answer 3

go to "google earth"