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What is the reflection of the point (1, 2, 3) in the xy-plane?
A(1, 2, -3)
B(-1, -2, 3)
C(1, -2, 3)
D(-1, 2, 3)
Answer & Solution
Correct answer: A. (1, 2, -3)
Reflection in the xy-plane changes only the sign of the z-coordinate.
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