Plane and spherical trigonometry / Agnes Cenen E. Sarmiento ... [et al.]. - Mandaluyong City : Books Atbp. Publishing, c2009. - vi, 157 p. : ill. ; 23 cm. Includes bibliographical references and index. ISBN: 9789710388776 Subjects--Topical Terms: Trigonometry. LC Class. No.: QA531 / .P62 2009