Plane and spherical trigonometry / by Paul R. Rider. Rider, Paul R. (Paul Reece), 1888- Trigonometry. QA531 .R52 514.6 RIP Protractor and "Four-place tables of the natural trigonometric functions" ([4] p.) in pocket. "Answers to odd-numbered exercises": p. 259-275. Includes index. New York : The Macmillan company, 1942. 1942. 1942 Text xiv, 275 p. : eng