Plane and spherical trigonometry:  a tetrahedron approach/ 
Millard R. Mamhot [and four others] 
 - Manila:  Unlimited Books Library Services & Publishing,  2015. 
 - vi, 214 pages:  illustrations;  23 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9789719654056 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plane<br/>Spherical trigonometry
<br/><br/><label>LC Class. No.: </label>Fil QA 531 .P712 2015