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I Great and Small Circles
II Spherical Triangles
III Spherical Geometry
IV Relations between the Trigonometrical Functions of the Sides
and the Angles of a Spherical Triangle
V Solution of Right-angled Triangles
VI Solution of Oblique-Angled Triangles
VII Circumscribed and Inscribed Circles
VIII Area of a Spherical Triangle. Spherical Excess
IX On certain approximate Formul
X Geodetical Operations
XI On small variations in the parts of a Spherical Triangle
XII On the connexion of Formul in Plane and Spherical Trigonometry.
XIII Polyhedrons
XIV Arcs drawn to fixed points on the Surface of a Sphere
XV Miscellaneous Propositions
XVI Numerical Solution of Spherical Triangles
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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