The calculated distance (air line) between Arivonimamo and Fianarantsoa is approximately 168 miles respectively 271 kilometers.
By car or train, the actual journey to Fianarantsoa is certainly longer, as only the direct route (as the crow flies) between Arivonimamo and Fianarantsoa has been calculated here.
Air line (approximately)
271 kilometers
146 nautical miles