Lesson Plan Math Class IX Ch-7 | Triangles

E- LESSON PLAN   SUBJECT MATHEMATICS    CLASS IX

Lesson plan for mathematics class IX, chapter 7, Triangles. cbse lesson plans for mathematics teachers,  Method to write lesson plan for maths class 9,  lesson plan for mathematics grade IX, lesson plan for maths teacher in B.Ed.

Board – CBSE	CLASS –IX	SUBJECT- MATHEMATICS
CHAPTER 7 : Triangles

TOPIC:-

Chapter:-  7 : Triangles

DURATION:-  

This lesson is divided into eight modules and it is completed in twenty class meetings.

PRE- REQUISITE KNOWLEDGE:-

Knowledge of different types of triangles

Knowledge of properties of triangle.

TEACHING AIDS:- 

Green Board, Chalk,  Duster, Charts, smart board, projector and laptop  etc.

METHODOLOGY:- 

Demonstration and Lecture method

OBJECTIVES:-

• Introduction with simple explanation of triangles.

• Theorem(Motivate) Two triangles are congruent if the three sides of one triangle are equal to three sides of the other triangles (SSS congruence rule)

• Theorem (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 condition)

• Theorem(Prove) Two triangles are congruent if any two angles and included side of one triangle is equal to the two angles and included side of other triangle (ASA congruence rule)

• Theorem(Motivate) Two right triangles are congruent if the hypotenuse and a side of one triangle are equal to the hypotenuse and a side of the other triangle. (RHS congruence rule).

• Theorem(Prove) The angles opposite to equal sides of a triangle are equal.

• Theorem(Motivate) The sides opposite to equal angles of a triangle are equal.

• Theorem(Motivate) Triangle inequalities and relation between , angle and facing side (inequalities in triangles).

PROCEDURE :-

Teacher will ask the class about different types of triangles and about simple properties of triangle. After getting the different answers from the class, Teacher himself explains these topics , step by step as follows.

S. No	Topic [For complete explanation of the topic click here]
1	Introduction : A polygon with three sides is called a triangle. There are six types of triangles, three on the basis of angles and other three on the basis of sides. Triangles on the basis of angles are Acute angled triangle, Right angled triangle and obtuse angled triangle. Triangles on the basis of sides are : Scalene triangle, isosceles triangle and equilateral triangle. Sum of three angles of triangle is always equal to 180o.
2	Now teacher will explain congruency of different figures. Congruence of figures :  Two identical figures are called congruent figures. Congruency in triangles :  If two triangles are congruent then their corresponding angles and sides are equal. All circles with same radius are congruent . All squares with same side are congruent. All equilateral triangles with same side are congruent.
3	Congruence in triangles: Two triangles are congruent if their corresponding sides and angles are equal. There are 5 conditions used to prove congruence in triangles: SSS, SAS, ASA, AAS, RHS
4	Teacher should motivate the students by giving the proof of SSS, SAS, AAS and RHS congruency rule. Note: Theorem used to motivate the students may not be asked in the examinations. These are only to motivate the students.
5	Now teacher will provide complete proof of the theorem ASA congruence rule and students should prepare this proof for the examination.
6	Now teacher explain that angle opposite to equal sides of triangle are equal  with complete proof for the examination.
7	Teacher also provide motivational proof for the converse of the above theorem that is ‘ sides opposite to equal angles of a triangle are equal’.
8	Now provide motivational proof of the theorem based on the triangular inequalities. Sum of any two sides of a triangle is always greater than the third side. In any triangle Difference of two sides < Third side < Sum of two sides. In a triangle angle opposite to the greater side is greater and the angle opposite to the smaller side is small.

EXPECTED OUTCOMES:-

• After studying this lesson students will be able  to understand the

• Different types of triangles.

• Different congruence conditions.

• Proof of the important theorems (ASA and angle opposite to equal sides of a triangle are equal).

• Triangular inequalities.

STUDENTS DELIVERABLES:-

• Review questions and all basic points assigned by the teacher.  
• Solve NCERT problems with examples and with important theorems.
• Students may prepare their Power Point Presentation on the properties of triangle.

EXTENDED LEARNING:-

Students can extend their learning by studying basic concepts and formulas of mathematics through the Resource Centre Mathematics and can find interesting topics on mathematics at the site  https://www.cbsemathematics.com/

ASSESSMENT TECHNIQUES:-

At the end of the lesson a Class Test will be taken.

Re-test(s) will be conducted on the basis of the performance of the students in the test.

Worksheets and assignments should be given to the students.

Arrangement should be made for the oral test or quiz competitions.

PDF Format of Lesson Plan Class IX

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