Exercise 4.3.4 Find the area of the triangle with the fol- lowing vertices. a. A(3, −1, 2), B(1, 1, 0), and C(1, 2, −1) b. A(3, 0, 1), B(5, 1, 0), and C(7, 2, −1) c. A(1, 1, −1), B(2, 0, 1), and C(1, −1, 3) - d. A(3, 1, 1), B(4, 1, 0), and C(2, −3, 0)

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