42 Chapter 1 Fundamental Concepts 3. In Figure 1.40, is a right triangle whose vertices are A(2, 0), B(-1,4), and C(-2,-3). Find the vertex angle whose measure is equal to 90°. Solution B (-1, 4) A (2, 0) C (2,-3) Figure 1.40. Right Triangle.

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A: We will find all the coordinates as following.

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