Oh come now, Mur :P
If I recall correctly, satellites would not be able to orbit the Earth were it not for the curvature being in sync with the velocity of the satellite, because the satellite is always "falling". The fact that this orbiting takes place along the same principles as circular motion we see in front of our eyes, suggests that the Earth is round.
Also, as a random fact: the Earth is not exactly round, it has a bulge and a very irregular surface, but these are negligible due to the Earth's minuscule size compared to the sun.
Another proof that the Earth is round: sunlight. The concentration of sunlight received at the surface of the Earth at the equator is not the same as the concentration received at the poles, which is why poles are much colder. This is because the sunlight has to travel a farther (diagonal) distance and is spread over a wider area at the poles, and a small horizontal distance at the equator (in reality its the Tropics alternatively, not the equator btw). On a flat surface, sunlight would be distributed equally throughout the entire 'Earth' and there would be no such temperature difference. Google images this: "latitudinal effect"
If you didn't know these facts: I'm shocked lol
If you knew them: Please shock me by proving how these do not answer your question