Because all of Australia is south of the equator
and less than 180° east of the Prime Meridian.
Each 'meridian' is a line of constant longitude.
Lines of latitude and longitude allows any position on the Earth to be plotted.
longitude
Lines of latitude and longitude allow a specific point to be located any where on the world.
No , Lines of Latitude and Longitude are not rays because they do not go on infinitely (forever). They are only imaginary lines that exist on Earth.
No "named" line of longitude crosses Australia. The Tropic of Capricorn (latitude) crosses Australia.
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lines of latitude
latitude?
Australia lies entirely east of the prime meridian of longitude and entirely south of the equator.
Each 'meridian' is a line of constant longitude.
Latitude.
Every meridian of longitude is perpendicular to every parallel of latitude, and every parallel of latitude is perpendicular to every meridian of longitude.
Latitude and longitude
The lines that intercept latitude lines are lines of longitude.
Lines of Longitude
Every parallel of latitude crosses every meridian of longitude.