The calculated distance (air line) between Zürich (Kreis 3) / Alt-Wiedikon and Baar is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Baar is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 3) / Alt-Wiedikon and Baar has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles