10th maths tamil medium chapter 5 exercise 5.2 full 10th maths exercise 5.2 sum 1, 2, 3, 4, 5, 6, 7, 8, 9 , 10, 11, 12 and 13 10th maths exercise 5.2 1st, 2nd , 3rd, 4th, 5th, 6th, 7th 8th, 9th, 10th, 11th, 12th and 13th sum