Discusses the properties and types of triangles, explaining that a triangle is a closed figure with three sides and angles. It categorizes triangles into equilateral, isosceles, scalene, obtuse, right ...

In this triangle \(a^2 = b^2 + c^2\) and angle \(A\) is a right angle. Pythagoras' theorem only works for right-angled triangles, so you can use it to test whether a triangle has a right angle or not.

Download the Class 9 Maths Chapter 7 - Triangles in PDF format. Students should study the chapter provided by Jagran Josh only as we present you the latest edition of the chapter which is available at ...