miles
The Length of the Australian Coast line is 34,218 km.
feet
millimeter
Meters
The appropriate unit is a metre.
The measure of the length of a coastline depends on the level of detail at which the measuring is done. For example: if you measure the coastline of a roughly circular island, at a low level of detail, where little ins and outs along the coastline are ignored, the length will be shorter than if you measure every in and out at a fine level of detail, because each of these little ins and outs adds to the length. The closer or finer you measure, the longer the measurement. This is called the "coastline paradox".
the answer is miles
The Length of the Australian Coast line is 34,218 km.
yards
A centimetre.
inches
Hs
That depends upon the length of the stick you use to measure it. See related link on length of coastline of Britain.
A tenth of a metre.
Centimeters.
Meters
feet