What does the word perimeter mean?

Usage examples for perimeter

  1. Archimedes, in fact, was the first to know the approximate relation of circumference to diameter; from it he deduced the perimeter and surface of the circle, as well as the surface and volume of the sphere. – The Life of the Spider by J. Henri Fabre
  2. Were they waiting at the right perimeter, as they were supposed to be? – Caribbee by Thomas Hoover
  3. Vasant Rao had insisted that all carts be kept within the perimeter of the camp, inside the circle of guards. – The Moghul by Thomas Hoover