Exercise 12.1 class 10 question 9 July 8, 2019 16 32 64 128 Exercise 12.1 class 10 surface area and volume question 9 Exercise 12.1 question number 9 class 10 Class 10 maths chapter 12 exercise 12.1 question 9 Exercitii matematica clasa 9 Unit 9 exercise Workbook unit 3 grade 10