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In parallelogram A(-1,2,1), B(1,-2,5), C(4,-7,8), D(2,-3,4), side BC equals
Aroot 43
B6
Croot 34
Droot 36
Answer & Solution
Correct answer: A. root 43
BC squared is 9 + 25 + 9 = 43, which also equals AD squared, so BC = root 43.
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