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Van Brummelen, G. (2017-04-04). The Modern Approach: Right-Angled Triangles. In Heavenly Mathematics: The Forgotten Art of Spherical Trigonometry. : Princeton University Press. Retrieved 27 Jun. 2022, from https://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691175997.001.0001/upso-9780691175997-chapter-005.