Question: 21) The Triangle Sum Theorem and the Exterior Angle Theorem, along with other basic concepts of plane geometry, change on the surface of a sphere.

21) The Triangle Sum Theorem and the Exterior
21) The Triangle Sum Theorem and the Exterior Angle Theorem, along with other basic concepts of plane geometry, change on the surface of a sphere. For example, use the figure to the right and try to sketch a triangle with three right angles. Explain how these two theorems change in a 3-dimensional or non-Euclidean world

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