In Exercises 28 and 29, (a) find the lengths of the sides of ARST, (b) use the converse of the Pythagorean Theorem to show that ARST is a right triangle, and (c) find the product of the slopes of RT and ST. 28. R(4, 2), S(–1, 7), T(1, 1) 29. R(4, 3), S(- 3, 6), T(2, 1)

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