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Maths course for Class 9 students

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Maths course for Class 9 students

Learn maths in fun way, enjoy your every class

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Requirements

  • laptop, internet, pen and notebook

Description

Number Systems
Real Numbers (Periods 20)
Review of representation of natural numbers, integers, rational numbers on the number line.
Representation of terminating/non-terminating recurring decimals, on the number line through
successive magnification. Rational numbers as recurring/terminating decimals.
03062014
59
Syllabus
for
Secondary
and
Higher
Secondary
Levels
Examples of nonrecurring/non terminating decimals such as 2 , 3, 5 etc. Existence of
non-rational numbers (irrational numbers) such as 2 , 3 and their representation on the number
line. Explaining that every real number is represented by a unique point on the number line, and
conversely, every point on the number line represents a unique real number.
Existence of x for a given positive real number x (visual proof to be emphasized). Definition
of nth root of a real number.
Recall of laws of exponents with integral powers. Rational exponents with positive real bases
(to be done by particular cases, allowing learner to arrive at the general laws).
Rationalisation (with precise meaning) of real numbers of the type (and their combinations)
1 1 and
a b x x y + + where x and y are natural numbers and a, b are integers.
Unit II: Algebra
Polynomials (Periods 25)
Definition of a polynomial in one variable, its coefficients, with examples and counter examples,
its terms, zero polynomial. Degree of a polynomial. Constant, linear, quadratic, cubic polynomials;
monomials, binomials, trinomials. Factors and multiples. Zeros/roots of a polynomial/equation.
State and motivate the Remainder Theorem with examples and analogy to integers. Statement
and proof of the Factor Theorem. Factorisation of ax2
+ bx + c, a ≠ 0 where a, b, c are real
numbers, and of cubic polynomials using the Factor Theorem.
Recall of algebraic expressions and identities. Further identities of the type:
(x + y + z)
2
= x
2
+ y
2 + z
2
+ 2xy + 2yz + 2zx, ±
3
( ) x y = ± ± ± 3 3
x y xy x y 3 ( ),
x
3
+ y
3
+ z
3
– 3xyz = (x + y + z) (x
2
+ y
2
+ z
2
– xy – yz – zx) and their use in factorization of
polynomials. Simple expressions reducible to these polynomials.
Linear Equations in Two Variables (Periods 12)
Recall of linear equations in one variable. Introduction to the equation in two variables. Prove that
a linear equation in two variables has infinitely many solutions, and justify their being written as
ordered pairs of real numbers, plotting them and showing that they seem to lie on a line. Examples,
problems from real life, including problems on Ratio and Proportion and with algebraic and
graphical solutions being done simultaneously.
Unit III: Coordinate Geometry (Periods 9)
The Cartesian plane, coordinates of a point, names and terms associated with the coordinate
plane, notations, plotting points in the plane, graph of linear equations as examples; focus on
linear equations of the type ax + by + c = 0 by writing it as y =mx + c and linking with the chapter
on linear equations in two variables.
03062014
Syllabus
for
Secondary
and
Higher
Secondary
Levels
60
Unit IV: Geometry
1. Introduction to Euclid’s Geometry (Periods 6)
History – Euclid and geometry in India. Euclid’s method of formalizing observed phenomenon
into rigorous mathematics with definitions, common/obvious notions, axioms/postulates, and
theorems. The five postulates of Euclid. Equivalent versions of the fifth postulate. Showing the
relationship between axiom and theorem.
1. Given two distinct points, there exists one and only one line through them.
2. (Prove) Two distinct lines cannot have more than one point in common.
2. Lines and Angles (Periods 10)
1. (Motivate) If a ray stands on a line, then the sum of the two adjacent angles so formed is
180° and the converse.
2. (Prove) If two lines intersect, the vertically opposite angles are equal.
3. (Motivate) Results on corresponding angles, alternate angles, interior angles when a transversal
intersects two parallel lines.
4. (Motivate) Lines, which are parallel to a given line, are parallel.
5. (Prove) The sum of the angles of a triangle is 180°.
6. (Motivate) If a side of a triangle is produced, the exterior angle so formed is equal to the
sum of the two interior opposite angles.
3. Triangles (Periods 20)
1. (Motivate) Two triangles are congruent if any two sides and the included angle of one
triangle is equal to any two sides and the included angle of the other triangle (SAS Congruence).
2. (Prove) Two triangles are congruent if any two angles and the included side of one triangle is
equal to any two angles and the included side of the other triangle (ASA Congruence).
3. (Motivate) Two triangles are congruent if the three sides of one triangle are equal to three
sides of the other triangle (SSS Congruence).
4. (Motivate) Two right triangles are congruent if the hypotenuse and a side of one triangle are
equal (respectively) to the hypotenuse and a side of the other triangle.
5. (Prove) The angles opposite to equal sides of a triangle are equal.
6. (Motivate) The sides opposite to equal angles of a triangle are equal.
7. (Motivate) Triangle inequalities and relation between ‘angle and facing side’; inequalities in a triangle.
4. Quadrilaterals (Periods 10)
1. (Prove) The diagonal divides a parallelogram into two congruent triangles.
2. (Motivate) In a parallelogram opposite sides are equal and conversely.
3. (Motivate) In a parallelogram opposite angles are equal and conversely.
03062014
61
Syllabus
for
Secondary
and
Higher
Secondary
Levels
4. (Motivate) A quadrilateral is a parallelogram if a pair of its opposite sides is parallel and equal.
5. (Motivate) In a parallelogram, the diagonals bisect each other and conversely.
6. (Motivate) In a triangle, the line segment joining the mid points of any two sides is parallel to
the third side and (motivate) its converse.
5. Area (Periods 4)
Review concept of area, recall area of a rectangle.
1. (Prove) Parallelograms on the same base and between the same parallels have the same area.
2. (Motivate) Triangles on the same base and between the same parallels are equal in area and its
converse.
6. Circles (Periods 15)
Through examples, arrive at definitions of circle related concepts, radius, circumference, diameter,
chord, arc, subtended angle.
1. (Prove) Equal chords of a circle subtend equal angles at the centre and (motivate) its converse.
2. (Motivate) The perpendicular from the centre of a circle to a chord bisects the chord and conversely,
the line drawn through the centre of a circle to bisect a chord is perpendicular to the chord.
3. (Motivate) There is one and only one circle passing through three given non-collinear points.
4. (Motivate) Equal chords of a circle (or of congruent circles) are equidistant from the centre(s)
and conversely.
5. (Prove) The angle subtended by an arc at the centre is double the angle subtended by it at any
point on the remaining part of the circle.
6. (Motivate) Angles in the same segment of a circle are equal.
7. (Motivate) If a line segment joining two points subtends equal angle at two other points lying
on the same side of the line containing the segment, the four points lie on a circle.
8. (Motivate) The sum of the either pair of the opposite angles of a cyclic quadrilateral is 1800
and its converse.
7. Constructions (Periods 10)
1. Construction of bisectors of a line segment and angle, 60°, 90°, 45° angles etc, equilateral triangles.
2. Construction of a triangle given its base, sum/difference of the other two sides and
one base angle.
3. Construction of a triangle of given perimeter and base angles.
Unit V: Mensuration
1. Areas (Periods 4)
Area of a triangle using Heron’s formula (without proof) and its application in finding the area of
a quadrilateral.
03062014
Syllabus
for
Secondary
and
Higher
Secondary
Levels
62
2. Surface Areas and Volumes (Periods 10)
Surface areas and volumes of cubes, cuboids, spheres (including hemispheres) and right circular
cylinders/cones.
Unit VI: Statistics and Probability
1. Statistics (Periods 13)
Introduction to Statistics: Collection of data, presentation of data – tabular form, ungrouped/
grouped, bar graphs, histograms (with varying base lengths), frequency polygons, qualitative analysis
of data to choose the correct form of presentation for the collected data. Mean, median, mode
of ungrouped data.
2. Probability (Periods 12)
History, Repeated experiments and observed frequency approach to probability. Focus is on
empirical probability. (A large amount of time to be devoted to group and to individual activities
to motivate the concept; the experiments to be drawn from real-life situations, and from examples
used in the chapter on statistics).

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About the Instructor