Problem

Three students attempt to define what a circle is.
Can you match the teacher's comments to the definitions?
Definition of a circle
Teacher's comments
  • Duru's definition: The set of all points in a plane that are the same distance away from some given point, which we call the center.
  • Oliver's definition: The set of all points in 3D space that are the same distance from a center point.
  • Carlos's definition: A perfectly round shape.
  • Your definition needs to be much more precise.
  • You seem to be confusing a circle with a sphere.
  • Stupendous! Well done.