The document discusses the definition and properties of quadrilaterals, outlining that they are formed by the union of four segments connecting four non-collinear points. It states that the sum of all interior angles in a quadrilateral is 360 degrees and lists different types of quadrilaterals including parallelogram, rectangle, rhombus, square, trapezium, and kite. It also poses questions related to the definition and types of quadrilaterals.

1. CLASS:VII

3. Can you imagine some 4
sided figure in these
pictures?????????????

4. But it is not easy to define quadrilateral
as the union of segments

5. Suppose A,B,C,D are
four points in a plane
such that
No three points are collinear.
. .
D C Collinear
. .
A
B
Collinear
means points
which lies on
a straight
line.
means points
which lies on
a straight
line.

6. If any two of the segments AB,
BC, CD, DA have a common point,
it is an end point only. That is,
D C
A B

7. 1. No three points are collinear.
2. If any two of the segments
AB, BC, CD, DA have a
common point, it is an end point
only.

8. If all above two conditions are
satisfied then the union of
segments AB, BC, CD and DA is
called quadrilateral. It is denoted by
-
ABCD

9. If we join the two triangles
side ways the figure
formed is quadrilateral

10. Sum of all the angles of the
quadrilaterals is 360º
D C
120º
60° 110°
A B
How much is angle C ?
170°X
70° √

11. The sum of the measures of
all angles of a triangle is
_____.
1. 360° X
2. 180° √
3. 90° X

12. Different type of quadrilaterals
are
1. Parallelogram
2. Rectangle.
3. Rhombus.
4. Square.
5. Trapezium.
6. Kite.

13. Parallelogram

14. Rectangle

15. Rhombus

16. Square

17. Trapezium

18. Kite

19. Answer the following
questions.
1.Define quadrilateral.
2.Name the different types
of quadrilaterals.
3.What is the sum of all the
angles of quadrilateral?