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TRIANGLES   We have already learnt that a three sided (line segments) closed plane figure is called a triangle. When the three sides of a triangles meet,

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Presentation on theme: "TRIANGLES   We have already learnt that a three sided (line segments) closed plane figure is called a triangle. When the three sides of a triangles meet,"— Presentation transcript:

1 TRIANGLES We have already learnt that a three sided (line segments) closed plane figure is called a triangle. When the three sides of a triangles meet, they also form three angles. So it is called a triangle.

2 Different Types of Triangles
There are several different types of triangles. You can classify a triangle by its sides and its angles. There are THREE different classifications for triangles based on their sides. There are three different classifications for triangles based on their angles.

3 Classification of Triangles based on Sides
Equilateral Triangle: If all the three sides of a triangle are equal then it is called an Equilateral triangle. Isosceles Triangle: If any two sides of a triangle are equal then it is called an isosceles triangle.

4 Scalene Triangle: Example
If all the three sides of a triangle are unequal then it is called a scalene triangle Example Q1:- Write the type of triangle, based on their sides Ans: In ∆ABC, AB=7cm, BC=7cm, CA=7cm. All sides in the triangle are equal. So, ∆ABC is an equilateral triangle.

5 Q2:- Write the type of triangle, based on their sides
Ans:- In ∆PQR, PQ=5cm, QR=2cm, RP=2cm. Two sides PQ and RP in the triangle are equal. So, therefore ∆PQR is an isosceles triangle. Q3:- Write the type of triangle, based on their sides Ans:- In ∆XYZ, XY=7cm, YZ=5cm , ZX=4cm. All three sides in the triangle are unequal. So, ∆ABC is an scalene triangle.

6 Q4:- Write the type of triangle, based on their sides
In ∆ABC, AB=3cm, BC=6cm, CA=3cm. Ans:- Two sides AB and CA in the triangle are equal. So, ∆ABC is an isosceles triangle. Q5:- Write the type of triangle, based on their sides In ∆PQR, PQ=4cm, QR=4cm, RP=4cm. All sides in the triangle are equal. So, ∆PQR is an equilateral triangle. Q6:- Write the type of triangle, based on their sides In ∆XYZ, XY=4cm, YZ=3cm, ZA=6cm. All three sides in the triangle are unequal. So, ∆XYX is an scalene triangle.


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