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Geometry :smiley: - Coggle Diagram

- - - - Adjacent
      - Vertically opposite
      - Angles at a point
    - - Interior
      - Alternate
      - Corresponding
    - - Supplementary
        
        Two angles that add up to 180°
      - Complementary
        
        Two angles that add up to 90°
  - - - 180°
    - - More than 180°
    - - 90°
    - - More than 90°
    - - Less than 90°
- - - - By side
        
        Isosceles
        
        Two equal angles
        
        Two equal sides
        
        Equilateral
        
        Three equal sides
        
        All angles are 60°
        
        Three equal angles
        
        Scalene
        
        No equal sides
        
        No equal angles
      - By angle
        
        Right-angled
        
        One angle is 90°
        
        Acute
        
        All angles are less than 90°
        
        Obtuse
        
        One angle is more than 90°
  - - - Formula: 1/2(base1 + base2) x height
      - At least one pair of parallel lines
    - - Formula: (base x height)
      - Two pairs of parallel lines
      - All angles are 90°
    - - Formula: (side x side)
      - All four sides are equal
      - All four angles are 90 degrees
    - - Formula: (base x height)
      - Two pairs of parallel lines
      - Opposite angles are equal
    - - Formula: (base x height)
      - Opposite angles are equal
      - All four sides are equal
    - - Formula: 1/2(height1 + height2) x base
      - 2 pairs of equal adjacent lines