Welcome to the chapter Triangles I, where you will learn about similar figures and understand how similarity helps in comparing geometrical shapes. In this chapter, you will define similar figures and study how figures with the same shape but different sizes are related mathematically.

You will explore the concept of similarity of triangles and learn how corresponding sides and angles of similar triangles are related. The chapter focuses on the criteria for similarity of triangles, such as AA, SAS, and SSS, which help in proving whether two triangles are similar or not. This chapter strengthens logical reasoning, proof skills, and forms an important foundation for geometry topics required in the CBSE Board examinations.