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Polygons (common types (triangle (isosceles: 2 equal sides and 2 equal…

- - - - square: rectangle with 4 equal sides
    - - rhombus: parallelogram where all sides are the same length
    - - isosceles trapezium: 2 pairs of equal angles; 2 sides of same length
- - - - can be used to derive that sum of angles in a polygon = (number of sides - 2) * 180
    - - interior angles that meet at each point must add up to 360 degrees
      - regular polygons that tessellate = hexagon (120 degree interior angles), triangle (60 degrees), square (90 degrees)
      - polygons in a repeated pattern with no gaps or overlaps