Plane geometry with basic trigonometry: a simplified approach/ Felipe Sarmiento, Wilfredo N. De Castro - Manila: Unlimited Books, 2016. - viii, 285 pages: illustrations; 25 cm. Includes bibliographical references. ISBN: 9789719654162 Subjects--Topical Terms: Geometry, Plane -- Study and teaching LC Class. No.: Fil QA 455 .S27 2016