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# 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
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
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
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
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
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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