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INTRODUCTION
•   Word quadrilaterals is derived from two words “QUADRI” means “FOUR”
    and “LATERAL” Means “sides”
A plain figure bounded by four line segments AB,BC,CD & DA is called quadrilateral.


                                                          DIAGONALS




VERTICES: The points A,B,C & D are called its vertices.
SIDES: four line segments AB,BC,CD & DA are four sides
DIAGONALS: two line segments AC & BD are called its diagonals
ANGLES OF QUADRILATERALS
   The sum of the interior
 angles of any polygon is
 (N-2)1800, where N is the
         number of sides
The sum of interior angles
  of a quadrilateral ABCD
          is (4-2)180=360
  The sum of the exterior
 angles of any polygon is
                     360
TYPES & PROPERTIES OF QUADRILATERALS
THE RECTANGLE
RECTANGLE: A parallelogram in which each angle is 90 degree. Is called a
  rectangle
THE PARALLELOGRAM
Parallelogram: a quadrilateral whose both pairs of opposite sides are
   parallel is called a parallelogram

                       D                                   C




          A                                     B
THE RHOMBUS
Rhombus: A parallelogram whose all sides are equal is called a rhombus
THE TRAPEZIUM
Trapezium: A quadrilateral in which one pair of opposite sides is parallel is
   called a trapezium. ABCD is a trapezium in which AB PARALLEL TO DC



                        C                      D




               A                                         B
MID-POINT THEOREM
•   The line segment joining the mid-point of two sides of a triangle is
    parallel to the third side
Thank you

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QUADRILATERALS

  • 1.
  • 2. INTRODUCTION • Word quadrilaterals is derived from two words “QUADRI” means “FOUR” and “LATERAL” Means “sides”
  • 3. A plain figure bounded by four line segments AB,BC,CD & DA is called quadrilateral. DIAGONALS VERTICES: The points A,B,C & D are called its vertices. SIDES: four line segments AB,BC,CD & DA are four sides DIAGONALS: two line segments AC & BD are called its diagonals
  • 4. ANGLES OF QUADRILATERALS The sum of the interior angles of any polygon is (N-2)1800, where N is the number of sides The sum of interior angles of a quadrilateral ABCD is (4-2)180=360 The sum of the exterior angles of any polygon is 360
  • 5.
  • 6. TYPES & PROPERTIES OF QUADRILATERALS
  • 7. THE RECTANGLE RECTANGLE: A parallelogram in which each angle is 90 degree. Is called a rectangle
  • 8. THE PARALLELOGRAM Parallelogram: a quadrilateral whose both pairs of opposite sides are parallel is called a parallelogram D C A B
  • 9. THE RHOMBUS Rhombus: A parallelogram whose all sides are equal is called a rhombus
  • 10. THE TRAPEZIUM Trapezium: A quadrilateral in which one pair of opposite sides is parallel is called a trapezium. ABCD is a trapezium in which AB PARALLEL TO DC C D A B
  • 11. MID-POINT THEOREM • The line segment joining the mid-point of two sides of a triangle is parallel to the third side