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 ...

A Sequel to the First Six Books of the Elements of Euclid; containing an Easy Introduction to Modern Geometry (with numerous Examples). By John Casey (Dublin: Hodges, 1886.) ...

CBSE: Check important extra questions based on Class 9 Maths NCERT textbook, Chapter 5 Introduction To Euclid's Geometry & prepare for CBSE Class 9 Maths exam 2020-21.