Explorations an Introduction to Astronomy          Thomas T. Arny Instructor Resources

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Chapter Images

Chapter 17, Figure 13

Figure 17.13

Figures illustrating how the shape of a surface determines the geometry of a triangle on it. (A) The interior angles of a triangle on the surface of the Earth add up to more than 180Ú. (B) The interior angles of a triangle on a flat surface add up to 180Ú. (C) The interior angles of a triangle on a saddle-shaped surface add up to less than 180Ú.

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