Two equivalent versions of Euclid’s fifth postulate are: (i) ‘For every line l and for every point P not lying on l, there exists a unique line m passing through P and parallel to l’.

exercise 5.2 based on the Equivalent versions of Euclid’s fifth postulate was completely removed. So, now just one exercise remains in the chapter. Below are the NCERT Solutions for Class 9 ...

Things which are equal to the same thing are also equal to one another. If equals be added to equals, the wholes are equal. If equals be subtracted from equals, the remainders are equal.