Geometry
Quadrilaterals
Not all things with four sides have to be squares or rectangles! We will now broaden our understanding of quadrilaterals!
  1. Quadrilateral Overview
  2. Quadrilateral Properties
  3. Proof - Opposite Sides of Parallelogram Congruent
  4. Proof - Diagonals of a Parallelogram Bisect Each Other
  5. Proof - Opposite Angles of Parallelogram Congruent
  1. Proof - Rhombus Diagonals are Perpendicular Bisectors
  2. Proof - Rhombus Area Half Product of Diagonal Length
  3. Area of a Parallelogram
  4. Whether a Special Quadrilateral Can Exist
  5. Rhombus Diagonals