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A(3, 4) is reflected in the -axis to give A′. How long is the segment AA′?

Class 9Figures on the Coordinate PlaneCoordinate Geometry
  • A10 units
  • B4 units
  • C8 units
  • D6 units

Step-by-Step Solution

A′ = (3, −4). AA′ is vertical: 4 − (−4) = 8 units. (4 is only the distance from A to the axis.)
Answer: C) 8 units

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