Course Content
Laboratory Manual Mathematics Class 9th
Basic Geometrical facts by paper folding.
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Video 1- Basic geometrical facts by paper folding.
08:04
Video 2- Activities using a geoboard
09:22
Video 3- Divide a strip of paper into a given number of equal parts
03:12
Video 4- congruency of two triangles by usi ng a collection of triangular cut-outs.
02:03
Video 5- verify the identity : a³ – b³ = (a – b) (a² + ab + b²).
03:28
Video 6- verify the identity : a³ + b³ = (a + b) (a² – ab + b²).
03:32
Video 7- verify the identity : a³ + b³ = (a + b)³ – 3ab (a + b).
02:12
Video 8- Show the factors of x² + bx + c geometrically
06:45
Video 9- Construction of a Square Root Spiral
03:54
Video 10- Identity : a² – b² = (a + b) (a – b).
03:00
Video 11- identity : (a + b)³ = a³ + b³ + 3ab (a + b).
03:01
Video 12- identity : (a + b)³ = a³ + 3a²b + 3ab² + b³
03:13
Video 13- identity : (a + b)² = a² + 2ab + b²
02:37
Video 14- To verify the mid-point theorem
03:35
Video 15- To show that a diagonal of a parallelogram divides it into two congruent triangles.
01:27
Video 16- diagonals of a parallelogram bisect each other
01:54
Video 17- Parallelogram is obtained by joining the mid-points of the adjacent sides of a quadrilateral
02:07
Video 18- Construction of the graph of the relation between °C and °F scales
04:33
Video 19- Perpendicular drawn to a chord of a circle from its centre bisects the chord.
02:51
Video 20- Angles in the same segment of a circle are equal.
03:20
Video 21- Angle sum property of the opposite angles of a cyclic quadrilateral
03:45
Video 22- The volume of a cone is one-third of the volume of a cylinder
02:02
Video 23- Volume of a sphere by using a measuring cylinder (jar).
02:49
Video 24- Parallelogram Characterstics.
06:01
Lab Manual Mahematics Class 9 CBSE
About Lesson

To find the following basic geometrical facts by paper folding :
1. The mid-point of a line-segment.
2. The perpendicular bisector of a line-segment.
3. The bisector of an angle.
4. The perpendicular to a line from a point given outside it.
5. The perpendicular to a line at a point given on the line.
6. The medians of a triangle.

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Varun Yadav 1 month ago
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