Triangles Theorems Class 10 Notes | EduRev

Class 10 : Triangles Theorems Class 10 Notes | EduRev

 Page 1


Class 1:  Angles  
Class 2:  Parallel lines and angles     
Class 3: Quadrilaterals and types of triangles. 
Class 4: Congruent triangles.  
Class 5: Theorems 1- 4 
Class 6: Theorems 5 & 6  
Class 8: Theorem 8 
Class 9: Theorem 9  
Class 10: Theorem 10  
Menu 
Select the class required then click 
mouse key to view class. 
Class 7: Theorem 7 and the three deductions.(Two classes is advised)   
Page 2


Class 1:  Angles  
Class 2:  Parallel lines and angles     
Class 3: Quadrilaterals and types of triangles. 
Class 4: Congruent triangles.  
Class 5: Theorems 1- 4 
Class 6: Theorems 5 & 6  
Class 8: Theorem 8 
Class 9: Theorem 9  
Class 10: Theorem 10  
Menu 
Select the class required then click 
mouse key to view class. 
Class 7: Theorem 7 and the three deductions.(Two classes is advised)   
Angles 
An angle is formed when two lines meet. The size of the angle measures 
the amount of space between the lines. In the diagram the lines ba and bc 
are called the ‘arms’ of the angle, and the point ‘b’ at which they meet is 
called the ‘vertex’ of the angle. An angle is denoted by the symbol ?.An 
angle can be named in one of the three ways:  
a 
c 
b 
. 
. 
Amount of space 
Angle 
Page 3


Class 1:  Angles  
Class 2:  Parallel lines and angles     
Class 3: Quadrilaterals and types of triangles. 
Class 4: Congruent triangles.  
Class 5: Theorems 1- 4 
Class 6: Theorems 5 & 6  
Class 8: Theorem 8 
Class 9: Theorem 9  
Class 10: Theorem 10  
Menu 
Select the class required then click 
mouse key to view class. 
Class 7: Theorem 7 and the three deductions.(Two classes is advised)   
Angles 
An angle is formed when two lines meet. The size of the angle measures 
the amount of space between the lines. In the diagram the lines ba and bc 
are called the ‘arms’ of the angle, and the point ‘b’ at which they meet is 
called the ‘vertex’ of the angle. An angle is denoted by the symbol ?.An 
angle can be named in one of the three ways:  
a 
c 
b 
. 
. 
Amount of space 
Angle 
1. Three letters 
a 
b 
c 
. 
. 
Using three letters, with the centre at the 
vertex. The angle is now referred to as : 
 ?abc or ?cba. 
Page 4


Class 1:  Angles  
Class 2:  Parallel lines and angles     
Class 3: Quadrilaterals and types of triangles. 
Class 4: Congruent triangles.  
Class 5: Theorems 1- 4 
Class 6: Theorems 5 & 6  
Class 8: Theorem 8 
Class 9: Theorem 9  
Class 10: Theorem 10  
Menu 
Select the class required then click 
mouse key to view class. 
Class 7: Theorem 7 and the three deductions.(Two classes is advised)   
Angles 
An angle is formed when two lines meet. The size of the angle measures 
the amount of space between the lines. In the diagram the lines ba and bc 
are called the ‘arms’ of the angle, and the point ‘b’ at which they meet is 
called the ‘vertex’ of the angle. An angle is denoted by the symbol ?.An 
angle can be named in one of the three ways:  
a 
c 
b 
. 
. 
Amount of space 
Angle 
1. Three letters 
a 
b 
c 
. 
. 
Using three letters, with the centre at the 
vertex. The angle is now referred to as : 
 ?abc or ?cba. 
2. A number 
c 
b 
. 
. 
1 
a 
Putting a number at the vertex of the angle. The 
angle is now referred to as ?1.  
Page 5


Class 1:  Angles  
Class 2:  Parallel lines and angles     
Class 3: Quadrilaterals and types of triangles. 
Class 4: Congruent triangles.  
Class 5: Theorems 1- 4 
Class 6: Theorems 5 & 6  
Class 8: Theorem 8 
Class 9: Theorem 9  
Class 10: Theorem 10  
Menu 
Select the class required then click 
mouse key to view class. 
Class 7: Theorem 7 and the three deductions.(Two classes is advised)   
Angles 
An angle is formed when two lines meet. The size of the angle measures 
the amount of space between the lines. In the diagram the lines ba and bc 
are called the ‘arms’ of the angle, and the point ‘b’ at which they meet is 
called the ‘vertex’ of the angle. An angle is denoted by the symbol ?.An 
angle can be named in one of the three ways:  
a 
c 
b 
. 
. 
Amount of space 
Angle 
1. Three letters 
a 
b 
c 
. 
. 
Using three letters, with the centre at the 
vertex. The angle is now referred to as : 
 ?abc or ?cba. 
2. A number 
c 
b 
. 
. 
1 
a 
Putting a number at the vertex of the angle. The 
angle is now referred to as ?1.  
3. A capital letter 
b 
. 
. 
B 
a 
c 
Putting a capital letter at the vertex of the angle. 
The angle is now referred to as ?B. 
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