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Lesson Plan Math Class IX Ch7  Triangles
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Board – CBSE 
CLASS –IX 
SUBJECT MATHEMATICS 
CHAPTER 7 : Triangles 
 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).
S. No 

1 
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 180^{o}.

2 
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 
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 
Note: Theorem used to motivate the students may not be asked in the examinations. These are only to motivate the students.

5 

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7 

8 
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.

 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.
 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.
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Thank you ,value able information
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