$\definecolor{red}{RGB}{255,0,0}$$\definecolor{black}{RGB}{0,0,0}$
  1. r
  2. r
  4. r
    • r   =   d /  2  
  1. d
  2. d
  4. d
    • d  =   r ·  2  
  1. P
  2. P
  4. P
    • P  =  2 · π · r 
    • P  =  π · d 
  1. A
  2. A
  4. A
    • A  =  π · r2
    • A  =  ( π · d2 ) / 4
Circle and disk: Radius, perimeter, diameter and area

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