GEOMETRY In 2-D 2.1.3   
 
  1. Essential Figures — continued
    1. Circle: radius r Circles: 
         Characteristic Notes   
      The distance from the center
      to any point on the circle is
      the (length of the) radius, r...
      1. Area  =  πr2 
      2. Circumference = 2πr
      3. diameter  =  2r 
    2. Fundamental Formula Exercises: 
      1. Perimeter & Area of a Trapezoid  Fractal Icon (link: Click to view Demo-Example #1)
      2. Circumference & Area of a Circle  Fractal Icon (link: Click to view Practice Problem #1)
    3. Additional Units of Area Measure: 
        Special Task #05: An Acre, A Hectare, and How Do They Compare?
      1. acre (a)  =  43,560 ft2
      2. hectare (ha)  =  10,000 m2
 
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