Question

Australia is smaller than Africa. (positive). ​

Answer 1

Answer:

Yes, Australia is smaller than Africa.

Answer 2

If you ask geographically

Yes Australia is smaller than Africa

And as you have written in the bracket positive so maybe you want me to make sentence into negative as your question is from the subject English

Then the answer can be

Australia is not smaller than Africa.

Or if you want the answer in positive then the answer will be

Africa is larger than Australia

Hope it helped u as I gave the answers from all the aspects.