Chapter 8: Quadrilaterals

Types of Quadrilaterals

Quadrilaterals

Angle Sum Property

Sum of angles = 360°360°


Types

TypeProperties
ParallelogramOpposite sides parallel & equal
RectangleParallelogram + all right angles
SquareRectangle + all sides equal
RhombusParallelogram + all sides equal
TrapeziumOne pair parallel sides

Properties of Parallelogram

  1. Opposite sides are parallel and equal
  2. Opposite angles are equal
  3. Diagonals bisect each other
  4. Adjacent angles are supplementary

Mid-Point Theorem

Line joining midpoints of two sides is parallel to third side and half its length