- Books Name
- CBSE Class 7 Mathematics Book

- Publication
- Param Publication

- Course
- CBSE Class 7

- Subject
- Mathmatics

**2. With respect to sides are:**

(a) Scalene triangles (b) Isosceles triangles (c) Equilateral triangles

** (a) Scalene Triangle: **A triangle in which no two sides are equal in length is called a scalene triangle.

• Length of all sides and measurement of all angles is different.

** (b) Isosceles Triangle **

(i) Two sides have same length

(ii) The angles opposite to the equal sides are equal.

If in DABC, AB = AC then *∠*B = *∠*C this is an isoceles triangle.

Converse is also true

If in a triangle two angles are equal then sides opposite to equal angles are equal in length.

In , if *∠*B = *∠*C then AB = AC.

**(c) Equilateral Triangle **

In an equilateral triangle

(i) All sides are equal in length.

(ii) Measurement of each angle is 60°.

In , if AB = BC = AC then ∠A = ∠B =∠C = 60°

or if then ∠A = ∠B = ∠C= 60° AB = BC = AC

- Books Name
- class 7 Mathematics Book

- Publication
- ReginaTagebücher

- Course
- CBSE Class 7

- Subject
- Mathmatics

**Special triangles**

**Two Special Triangles: Equilateral and Isosceles**

A triangle in which all the three sides are of equal lengths and each angle has measure 60^{o} is called an equilateral triangle.

In an equilateral triangle,

AB = BC = CA

And ÐA = ÐB = ÐC = 60^{0}

A triangle in which two sides are of equal lengths is called an isosceles triangle

In triangle XYZ,

XY = XZ

**Sum of the Lengths of Two Sides of a Triangle**

The sum of the lengths of any two sides of a triangle is greater than the length of the third side.

In the above figure,

AB + BC > AC

Also, the difference between the lengths of any two sides of a triangle is smaller than the length of the third side.

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## Batch List

###### Medha Sharma

Course : CBSE Class 7

Start Date : 06.12.2022

End Date : 18.07.2023

Types of Batch : Classroom