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We know that a closed figure formed by three intersecting 
lines is called a triangle(‘Tri’ means ‘three’).A triangle has 
three sides, three angles and three vertices. For e.g.-in 
Triangle ABC, denoted as ΔABC AB,BC,CA are the three sides, 
∠A,∠B,∠C are three angles and A,B,C are three vertices. 
A 
B C
CONGRUENCE OF TRIANGLE:- 
Let us take ΔABC and ΔXYZ such that 
corresponding angles are equal and 
corresponding sides are equal :- 
A 
B C 
X 
Y Z 
CORRESPONDING PARTS 
∠A=∠X 
∠B=∠Y 
∠C=∠Z 
AB=XY 
BC=YZ 
AC=XZ
Now we see that sides of ΔABC coincides with sides of 
ΔXYZ. 
A 
B C 
X 
Y Z 
TWO TRIANGLES ARE CONGRUENT, IF ALL THE 
SIDES SO WE GET AND THAT 
ALL THE ANGLES OF ONE TRIANGLE 
ARE EQUAL TO THE CORRESPONDING SIDES AND 
ANGLES OF THE OTHER TRIANGLE. 
Here, ΔABC ≅ ΔXYZ
CRITERIAS FOR CONGRUENCE OF TWO TRIANGLES 
SAS(side-angle-side) congruence 
• Two triangles are congruent if two sides and the included angle of one triangle are equal to 
the two sides and the included angle of other triangle. 
ASA(angle-side-angle) congruence 
• Two triangles are congruent if two angles and the included side of one triangle are equal to 
two angles and the included side of other triangle. 
AAS(angle-angle-side) congruence 
• Two triangles are congruent if any two pairs of angle and one pair of corresponding sides are 
equal. 
SSS(side-side-side) congruence 
• If three sides of one triangle are equal to the three sides of another triangle, then the two 
triangles are congruent. 
RHS(right angle-hypotenuse-side) congruence 
• If in two right-angled triangles the hypotenuse and one side of one triangle are equal to the 
hypotenuse and one side of the other triangle, then the two triangles are congruent.
A 
B C 
P 
Q R 
S(1) AC = PQ 
A(2) ∠C = ∠R 
S(3) BC = QR 
Now If, 
Then ΔABC ≅ ΔPQR (by SAS congruence)
A 
B C 
D 
E F 
Now If, A(1) ∠BAC = ∠EDF 
S(2) AC = DF 
A(3) ∠ACB = ∠DFE 
Then ΔABC ≅ ΔDEF (by ASA congruence)
A 
B C P 
Q 
R 
Now If, A(1) ∠BAC = ∠QPR 
A(2) ∠CBA = ∠RQP 
S(3) BC = QR 
Then ΔABC ≅ ΔPQR (by AAS congruence)
Now If, S(1) AB = PQ 
S(2) BC = QR 
S(3) CA = RP 
A 
B C 
P 
Q R 
Then ΔABC ≅ ΔPQR (by SSS congruence)
Now If, R(1) ∠ABC = ∠DEF = 90° 
H(2) AC = DF 
S(3) BC = EF 
A 
B C 
D 
E F 
Then ΔABC ≅ ΔDEF (by RHS congruence)
PROPERTIES OF TRIANGLE 
A 
B C 
A Triangle in which two sides are equal in length is called ISOSCELES 
TRIANGLE. So, ΔABC is a isosceles triangle with AB = BC.
Angles opposite to equal sides of an isosceles triangle are equal. 
A 
B C 
Here, ∠ABC = ∠ ACB
The sides opposite to equal angles of a triangle are equal. 
A 
B C 
Here, AB = AC
Theorem on inequalities in a triangle 
If two sides of a triangle are unequal, the angle opposite to the longer side is larger 
( or greater) 
10 
8 
9 
Here, by comparing we will get that- 
Angle opposite to the longer side(10) is greater(i.e. 90°)
In any triangle, the side opposite to the longer angle is longer. 
10 
8 
9 
Here, by comparing we will get that- 
Side(i.e. 10) opposite to longer angle (90°) is longer.
The sum of any two side of a triangle is greater than the third 
side. 
10 
8 
9 
Here by comparing we get- 
9+8>10 
8+10>9 
10+9>8 
So, sum of any two sides is greater than the third side.
SUMMARY 
1.Two figures are congruent, if they are of the same shape and size. 
2.If two sides and the included angle of one triangle is equal to the two sides and the 
included angle then the two triangles are congruent(by SAS). 
3.If two angles and the included side of one triangle are equal to the two angles and 
the included side of other triangle then the two triangles are congruent( by ASA). 
4.If two angles and the one side of one triangle is equal to the two angles and the 
corresponding side of other triangle then the two triangles are congruent(by AAS). 
5.If three sides of a triangle is equal to the three sides of other triangle then the two 
triangles are congruent(by SSS). 
6.If in two right-angled triangle, hypotenuse one side of the triangle are equal to the 
hypotenuse and one side of the other triangle then the two triangle are congruent.(by 
RHS) 
7.Angles opposite to equal sides of a triangle are equal. 
8.Sides opposite to equal angles of a triangle are equal. 
9.Each angle of equilateral triangle are 60° 
10.In a triangle, angles opposite to the longer side is larger 
11.In a triangle, side opposite to the larger angle is longer. 
12.Sum of any two sides of triangle is greater than the third side.
Triangles

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Triangles

  • 1.
  • 2. We know that a closed figure formed by three intersecting lines is called a triangle(‘Tri’ means ‘three’).A triangle has three sides, three angles and three vertices. For e.g.-in Triangle ABC, denoted as ΔABC AB,BC,CA are the three sides, ∠A,∠B,∠C are three angles and A,B,C are three vertices. A B C
  • 3. CONGRUENCE OF TRIANGLE:- Let us take ΔABC and ΔXYZ such that corresponding angles are equal and corresponding sides are equal :- A B C X Y Z CORRESPONDING PARTS ∠A=∠X ∠B=∠Y ∠C=∠Z AB=XY BC=YZ AC=XZ
  • 4. Now we see that sides of ΔABC coincides with sides of ΔXYZ. A B C X Y Z TWO TRIANGLES ARE CONGRUENT, IF ALL THE SIDES SO WE GET AND THAT ALL THE ANGLES OF ONE TRIANGLE ARE EQUAL TO THE CORRESPONDING SIDES AND ANGLES OF THE OTHER TRIANGLE. Here, ΔABC ≅ ΔXYZ
  • 5. CRITERIAS FOR CONGRUENCE OF TWO TRIANGLES SAS(side-angle-side) congruence • Two triangles are congruent if two sides and the included angle of one triangle are equal to the two sides and the included angle of other triangle. ASA(angle-side-angle) congruence • Two triangles are congruent if two angles and the included side of one triangle are equal to two angles and the included side of other triangle. AAS(angle-angle-side) congruence • Two triangles are congruent if any two pairs of angle and one pair of corresponding sides are equal. SSS(side-side-side) congruence • If three sides of one triangle are equal to the three sides of another triangle, then the two triangles are congruent. RHS(right angle-hypotenuse-side) congruence • If in two right-angled triangles the hypotenuse and one side of one triangle are equal to the hypotenuse and one side of the other triangle, then the two triangles are congruent.
  • 6. A B C P Q R S(1) AC = PQ A(2) ∠C = ∠R S(3) BC = QR Now If, Then ΔABC ≅ ΔPQR (by SAS congruence)
  • 7. A B C D E F Now If, A(1) ∠BAC = ∠EDF S(2) AC = DF A(3) ∠ACB = ∠DFE Then ΔABC ≅ ΔDEF (by ASA congruence)
  • 8. A B C P Q R Now If, A(1) ∠BAC = ∠QPR A(2) ∠CBA = ∠RQP S(3) BC = QR Then ΔABC ≅ ΔPQR (by AAS congruence)
  • 9. Now If, S(1) AB = PQ S(2) BC = QR S(3) CA = RP A B C P Q R Then ΔABC ≅ ΔPQR (by SSS congruence)
  • 10. Now If, R(1) ∠ABC = ∠DEF = 90° H(2) AC = DF S(3) BC = EF A B C D E F Then ΔABC ≅ ΔDEF (by RHS congruence)
  • 11. PROPERTIES OF TRIANGLE A B C A Triangle in which two sides are equal in length is called ISOSCELES TRIANGLE. So, ΔABC is a isosceles triangle with AB = BC.
  • 12. Angles opposite to equal sides of an isosceles triangle are equal. A B C Here, ∠ABC = ∠ ACB
  • 13. The sides opposite to equal angles of a triangle are equal. A B C Here, AB = AC
  • 14. Theorem on inequalities in a triangle If two sides of a triangle are unequal, the angle opposite to the longer side is larger ( or greater) 10 8 9 Here, by comparing we will get that- Angle opposite to the longer side(10) is greater(i.e. 90°)
  • 15. In any triangle, the side opposite to the longer angle is longer. 10 8 9 Here, by comparing we will get that- Side(i.e. 10) opposite to longer angle (90°) is longer.
  • 16. The sum of any two side of a triangle is greater than the third side. 10 8 9 Here by comparing we get- 9+8>10 8+10>9 10+9>8 So, sum of any two sides is greater than the third side.
  • 17. SUMMARY 1.Two figures are congruent, if they are of the same shape and size. 2.If two sides and the included angle of one triangle is equal to the two sides and the included angle then the two triangles are congruent(by SAS). 3.If two angles and the included side of one triangle are equal to the two angles and the included side of other triangle then the two triangles are congruent( by ASA). 4.If two angles and the one side of one triangle is equal to the two angles and the corresponding side of other triangle then the two triangles are congruent(by AAS). 5.If three sides of a triangle is equal to the three sides of other triangle then the two triangles are congruent(by SSS). 6.If in two right-angled triangle, hypotenuse one side of the triangle are equal to the hypotenuse and one side of the other triangle then the two triangle are congruent.(by RHS) 7.Angles opposite to equal sides of a triangle are equal. 8.Sides opposite to equal angles of a triangle are equal. 9.Each angle of equilateral triangle are 60° 10.In a triangle, angles opposite to the longer side is larger 11.In a triangle, side opposite to the larger angle is longer. 12.Sum of any two sides of triangle is greater than the third side.