Changes

===Notes for teachers===

===Notes for teachers===

The circumference of a circle  relates to one of the most important mathematical constants in all of mathematics. This constant pi, is represented by the Greek letter П.  The numerical value of π is 3.14159 26535 89793 , and is defined by the ratio of a circle's circumference to its diameter.  

The circumference of a circle  relates to one of the most important mathematical constants in all of mathematics. This constant pi, is represented by the Greek letter П.  The numerical value of π is 3.14159 26535 89793 , and is defined by the ratio of a circle's circumference to its diameter.  

  C = п. D  or  C = 2пr.

C = п. D  or  C = 2пr.

 

===Activity No # 1 Derivation of formula for circumference and the value for pi.===

===Activity No # 1 Derivation of formula for circumference and the value for pi.===

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