Rathnasinghe, Vipula ජ්යාමිතිය - Agasara Publishers Nugegoda 2014 - 273p 1 - 2023-09-15 ISBN: 978-955-0886-89-0 Nat. Bib. No.: 0003221 Nat. Bib. Agency Control No.: RAT Universal Decimal Class. No.: 510