GEOMETRY In 2-D 2.1.1   
 
  1. Essential Figures — Triangle: three sides a, b (base), c; height h
    1. Triangles: 
       Characteristic Notes 
      Three sides of length
      a, b, and c;  altitude
      of (length) height h...
      1. Perimeter  =  a + b + c 
      2. Area  =  ½ bh 
    2. Square: four sides of length s Squares: 
          Characteristic Notes    
      Four sides, each of length s...
      1. Perimeter = 4 s 
      2. Area  =  s2 
    3. Rectangles: 
      Rectangle: length l & width w    Characteristic Notes   
      The top & bottom (base)
      lines are parallel and are
      of length l, while the two
      sides are also parallel and
      of length w (commonly
      referred to as the width)...
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