Peape, John Paul A., Enhancing students' learning outcomes in trigonometry and geometry through trigeocirc device / John Paul A. Peape. - xiii, 104 leaves : Colored illustrations, tables, figures ; 28 cm. Includes bibliographical references. Subjects--Topical Terms: Mathematics education.Device.Manipulative.Learning outcomes. Dewey Class. No.: 371.33 / P358e