Final answer:
The continent at the coordinates 30 south latitude, 135 east longitude is Australia.
Step-by-step explanation:
The continent that includes the coordinates at 30 south latitude, 135 east longitude is Australia. Latitude and longitude are a part of the geographic coordinate system that allows us to pinpoint an exact location on Earth. In this system, latitude is the position north or south of the Equator, while longitude is the position east or west of the Prime Meridian.
With the given coordinates, we can determine that the location is south of the Equator and east of the Prime Meridian, which places it in the Eastern Hemisphere. Australia is the only continent that fits these criteria and is situated within this hemisphere at these coordinates.