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Geometry - Coggle Diagram

- - - - four sides
      - four angles
      - int. angles sum = 360
      - parallelograms
        
        area = base*height
        
        opposite angles are congruent
        
        two pairs of congruent sides
        
        two pairs of parallel sides
      - rectangles
        
        four right angles
        
        parallelogram
        
        area = width*length
      - rhombuses
        
        four congruent sides
        
        parallelogram
        
        area = (diagonal*diagonal)/2
      - squares
        
        rhombus and a rectangle combined
        
        four equal sides
        
        area = side^2
        
        perimeter = 4sides
      - kite
        
        adjacent sides congruent
        
        pair of opposite angles are congruent
        
        area = (diagonal*diagonal)/2
    - - five sides
      - five angles
      - int. angle sum = 540
      - interior angle = 108
      - pentagram
      - (5/4)(s^2)tan(3pi/10)
    - - seven sides
      - seven angles
      - interior angle = 128.571
      - int. angles sum = 900
      - central angle = 51.43 about
      - area = (7/4)a^2cot(180/7)
    - - area = pi*r^2
      - circumference = 2pi*r
      - everything is the same distance from center; radius
      - diameter = 2r