In the above figure we can see that AB ≠ BC ≠ AC.

Here, in the ΔABC, two sides are equal, AB = AC.

In the ΔABC, all the three sides are equal, AB = BC = AC

Q.1 Classify the following triangles on the basis of their sides mentioned below:

Q.2 Name the type of the triangle.

a) AB = 5 cm; BC = 3 cm and AC = 5 Cm.

b) PQ = 8 cm; QR = 8 cm and PR = 8 cm.

c) XY = 6 cm; YZ = 4 cm and XZ = 5 cm.

d) LM = 2 cm; MN = 4 cm and LN = 3 cm.

e) RA = AT = RT = 6.4 cm f) ST = 6.1cm; UT = 5.8cm and SU = 4.6cm

g) RM = MO = 8.2cm and RO = 9cm

Q.1

(i) Scalene Triangle

(ii) Isosceles Triangle

(iii) Equilateral Triangle

(iv) Scalene Triangle

(v) Isosceles Triangle

Q.2

a) Isosceles triangle.

b) Equilateral triangle.

c) Scalene triangle.

d) Scalene triangle.

e) Equilateral triangle.

f) Scalene triangle.

g) Isosceles triangle.

• Introduction to Triangles

• Types of Triangles on the basis of Sides

• Types of Triangles on the basis of Angles

• Angle Sum Property of Triangles

• Exterior and Interior angles of Triangle

• Triangle Inequality Property

• Congruent Triangles

• Postulates of Congruent Triangle

• Inequality in Triangle