How do i do this and what’d the answers

No3 australia no4 yes the coastline is irregular no5 you have to measure it in kilometres then convert back to miles no6 this is open for conjecture i do not believe so no7 in australia we use kilometres you have to convert to miles no8 the great barrier reef has many types of coral and beautiful sealife of all kinds use the encyclopedia britanica for this answer no9 australian west is a large state with many regions and yes there is a place called the great plateu