Class 10 maths chapter 9 formula in hindi July 8, 2019 16 32 64 128 Class 10 maths chapter 9 all formula in hindi Class 9 maths chapter 10 heron's formula in hindi Class 9 maths chapter 10 exercise 10.1 heron's formula in hindi 10 ичиндеги сандарды кошуу 1 класс 9 sinf algebra 15 mavzu