Dr.Reazul Hassan is a member of the primary curriculum at the National Curriculum and Textboard Board of Bangladesh (NCTB). Since 2010, the NCTB provides over 35crore textbooks to children all over Bangladesh. You might be wondering, who are the people behind this monumental task? They are constantly improving, changing, and adapting the books and curriculum to meet new standards and keeping them informative and engaging while also ensuring the children across the country receive their textbooks

NCERT Book Class 9 Maths Chapter 5 Introduction to EUCLID's Geometry (PDF) - AglaSem

NCERT Solutions for Class 9 Maths Session 2025-26

NCERT || Grade 09 || Maths || Quadrilaterals || Diagonals of Parallelogram