Herons Formula Here is the CBSE About 2.html Chapter 12 for Class 9 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 9 About 2.html Herons Formula Chapter 12 NCERT Solutions for Class 9 About 2.html Herons Formula Chapter 12 The following is a summary in Hindi and English for the academic year 2021-2022. You can save these solutions to your computer or use the Class 9 About 2.html.