Chapter 7 • Class 9 Mathematics
Triangles
Study by topic — one focused page each
1
Congruence of Triangles and Criteria for Congruence
What is Congruence of Triangles? In simple English, congruence means identical in every single way. If two shapes have the exact same shape and the ex…
Start this topic → 2Properties of a Triangle—Angles and Sides
What are the Properties of a Triangle's Angles and Sides? Triangles have beautiful internal mathematical relationships connecting their sides and angl…
Start this topic → 3Inequalities in a Triangle
What are Triangle Inequalities? In the previous topic, we looked at what happens when sides and angles are perfectly equal. But what happens when they…
Start this topic →Chapter-wide tests
Online Test
10 MCQ • 15 min
IMO / Olympiad Practice
Olympiad level • 15 min
📝 Full Chapter Test (Download & Print)
35 marks • 75 min • with answer key