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

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

12. Thank you