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Quadrilateral A(-1,2,1), B(1,-2,5), C(4,-7,8), D(2,-3,4): find the length AB.
A6
B7
Croot 43
D5
Answer & Solution
Correct answer: A. 6
AB squared is 4 + 16 + 16 = 36, so AB = 6, equal to CD, which supports a parallelogram.
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