Class 9 Maths NCERT Solutions Chapter 7 - Triangles Triangles Definition:- Triangle is a plane figure surrounded by three line segments. The symbol of Triangle is ∆ . Types of angle on the basis of sides On the basis of Sides – there are three types of triangles Equilateral Triangle: – In an equilateral triangle, all sides are equal. In the below figure, PQR is a triangle in which PQ=QR=PR, so it is an equilateral triangle. Isosceles Triangle : -A triangle having two sides equal is called an isosceles triangle. In the below figure ABC is a triangle in which AB=AC, hence it is an isosceles triangle. Scalene triangle – A triangle in which all the sides are of different in size is called a scalene triangle. In the below figure DEF is a triangle in which no side is equal. Perimeter of a triangle – The sum of lengths of three sides of a triangle is called its perimeter Read full article click here.... Chap...
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