What is a circle(circumference,radius,diameter,pi)

Question

What does a circle mean (circumference,radius,diameter,pi

Answer 1

A circle in plane geometry is DEFINED as the set of all points that are at a fixed distance from a stated center point.

 

As such, it's a uniformly curved 'line' and its length is defined as Circumference.

 

The area of a circle has a well known formula; it should be known as Area of circular disk, or interior area of a circle, = pi(r²).

 

Diameter is the largest possible chord of a circle, equal to twice the radius, r.

 

Pi is defined as the ratio of any circle's Circumference to its Diameter; ALL CIRCLES ARE SIMILAR.

 

Pi is about 3.14159265... and is not rational, and CERTAINLY SHOULD NEVER BE APPROXIMATED BY 22/7 in this age of calculators.