You don't need any information. Just answer it. You do need some idea of the area of something (ANYTHING) to compare to. Any area. The size of your state? Your city? Your country? The planet earth? For example, I happen to know that the planet earth has a surface area of 5 * 10^14 square meters (m^2). Don't ask me why. It's just something I picked up.
Oh and I know I haven't really shown you how. But let this be our learning example.
AND remember no looking up answers and no calculators. Do it in your head or on the back of a napkin or envelope or any scrap of paper.
Feel free to leave answers or guesses or questions or thoughts.