United States or Montserrat ? Vote for the TOP Country of the Week !
The shadow-geometry on the plane agrees with the the disc-geometry on the sphere. If we call the disc-shadows rigid figures, then spherical geometry holds good on the plane E with respect to these rigid figures. Moreover, the plane is finite with respect to the disc-shadows, since only a finite number of the shadows can find room on the plane. At this point somebody will say, "That is nonsense.
Word Of The Day