In Problems 4346, choose one of the following statements to complete the sentence, and discuss the reasoning

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In Problems 43–46, choose one of the following statements to complete the sentence, and discuss the reasoning for your selection.

The knowledge that the sum of the measures of the angles of a triangle is 180° is . . .
A. . . . known because of Figure 7.35

B. . . . certain, so the foundations of geometry would be destroyed if it were proved false.

C. . . . sometimes used to decide whether the geometry is on a plane, a pseudosphere, or a sphere.

Figure  7.35

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