Quadrilaterals

and



are shown on the coordinate grid.

Which sequence of transformations shows that the quadrilaterals are congruent?

A
reflect EFGHEFGHEFGH across the yyy-axis and then translate the image 555 units down

B
rotate EFGHEFGHEFGH 90°90°90° clockwise about the origin and then translate the image 555 units down

C
rotate EFGHEFGHEFGH 90°90°90° clockwise about the origin and then translate the image 555 units to the right

D
reflect EFGHEFGHEFGH across the yyy-axis and then translate the image 555 units to the right

1 answer

To determine which sequence of transformations shows that the quadrilaterals are congruent, we need to analyze each option:

  • A: Reflect EFGH across the y-axis and then translate the image 5 units down.
  • B: Rotate EFGH 90° clockwise about the origin and then translate the image 5 units down.
  • C: Rotate EFGH 90° clockwise about the origin and then translate the image 5 units to the right.
  • D: Reflect EFGH across the y-axis and then translate the image 5 units to the right.

For congruence, we must confirm that the resulting coordinates from the transformations precisely match the coordinates of the second quadrilateral.

  1. Reflection across the y-axis changes the x-coordinates of the points. If a point is at (x, y), it becomes (-x, y).

  2. Rotation 90° clockwise moves each point according to the rule (x, y) -> (y, -x).

  3. Translation involves adding/subtracting to the x or y coordinates.

You would need to look at the coordinates of both quadrilaterals before determining which transformation correctly causes congruence.

Without the specific coordinates of the quadrilaterals, I cannot give you the definitive answer. However, generally:

  • If quadrilateral EFGH needs to be flipped horizontally (negative x-values) and moved down, then Option A is suitable.

  • If rotating EFGH makes it align with the second quadrilateral, then Option B or C could work.

  • If flipping horizontally and moving right works, then Option D may be applicable.

Please provide the specific coordinates or drawings of the quadrilaterals so that we can analyze which transformation sequence achieves congruence.

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