B A CHATE

Learning Outcomes

To enable the students to understand the plane figures,polygons ,types of ploygons mainly convex polygons.

Students will be able to describe and classify the properties of, and relationship between plane and solid geometric figures.

Students will able to use the knowledge that the sum of angles of any triangle is 180 and the sum of angles of any quadrilateral is 360 to solve problems.

 

Students will have been introduced to quadrilaterals and their properties, terminology and specific characters of the quadrilaterals.There are infinite quadrilaterals in real life! Anything with 4 sides, even if the sides are uneven, is a quadrilateral. Examples could be: table top, book, picture frame, door, baseball diamond, etc

 

 

Description Of Activity

Quadrilateral is a four sided polygon.

Elements of a quadrilateral:

(i) Four sides (ii) Four Vertices (iii) Four Angles (iv ) Two Diagonals

Diagonal of a quadrilateral is the line segment joining the two non-consecutive.

 Parallelogram: A quadrilateral with opposite sides parallel and equal.

(i) Take a two different rectangular cardboard strips of different length.

(ii) Draw two parallel lines along its edges as shown in the figure.

 

(iii)Place the other strip in aslant position over the lines drawn and use this to draw two more lines as shown in figure below.

(iv) These four lines enclose quadrilateral. This is made-up of four pair of parallel lines.

 Properties of a parallelogram:

(a) Opposite angles of a parallelogram are equal.

(i) Draw a parallelogram ABCD on a cardboard.

(ii) Copy it on a tracing paper and name it as A’B’C’D’

(iii) Pin them together at a point where the diagonals meet each other.

(iv)Rotate the transparent sheet by180⁰.

(v) The parallelogram still coincide but you now find A’ lying exactly on C and vice versa, Similarly B’ lies on D and vice-versa.

(b) The diagonals of a parallelogram bisect each other:

    (i) Take a cut-out of a parallelogram, say, ABCD.

     (ii) Let its diagonals AC and DB meet at O.

     (iii) Find the mid- point of AC by a fold, placing C on A.

     (iv) Is the mid-point same as O?

    (v) Does this show that diagonal DB bisects the diagonal AC at the point O?

   (vi)Discuss it with your friends. Repeat the activity to find where the mid- point  

      of DB could lie.

 

 

Variations

This activity can be done by the small groups of the students with the help of differen type of materials such as paper sheets,match sticks,plastic straws and ice-cream sticks and verify the results among each group.

 

Coaching Tips

Students are motivated to perform the activities in their day to day teaching learning process.

Students are able to solve the problems based on the properties of the quadrilaterals.

students will be understand the logic of the performing activities in the teaching learning process.

Equipment/Material Required

Cardboard, chart paper,Pair of scissors,glue,matchsticks,straws,ice-cream sticks,thread,sketch pens.