I found the answer given here (https://stackoverflow.com/questions/6100528/why-do-3d-engines-primarily-use-triangles-to-draw-surfaces) easy to follow and intuitive as well.
I found the answer given here (https://stackoverflow.com/questions/6100528/why-do-3d-engines-primarily-use-triangles-to-draw-surfaces) easy to follow and intuitive as well.