Math Problem Statement

figures D and E are congruent. Figure D, with coordinates (1,2),(1,3),(3,5), and (4,1), is rotated 90 degrees clockwise about the origin and than reflected over the y-axis to transform onto figure E. what are the coordinates of figure E?

Solution

To find the coordinates of figure E, we need to apply two transformations to figure D: a 90-degree clockwise rotation about the origin, followed by a reflection over the y-axis.

Let's go step by step:

Step 1: 90-degree clockwise rotation about the origin

When a point (x,y)(x, y) is rotated 90 degrees clockwise about the origin, its new coordinates become (y,x)(y, -x).

Let’s apply this transformation to each of the points of figure D:

  • (1,2)(2,1)(1, 2) \rightarrow (2, -1)
  • (1,3)(3,1)(1, 3) \rightarrow (3, -1)
  • (3,5)(5,3)(3, 5) \rightarrow (5, -3)
  • (4,1)(1,4)(4, 1) \rightarrow (1, -4)

Step 2: Reflection over the y-axis

When a point (x,y)(x, y) is reflected over the y-axis, its new coordinates become (x,y)(-x, y).

Let’s apply this transformation to the points we obtained from the rotation:

  • (2,1)(2,1)(2, -1) \rightarrow (-2, -1)
  • (3,1)(3,1)(3, -1) \rightarrow (-3, -1)
  • (5,3)(5,3)(5, -3) \rightarrow (-5, -3)
  • (1,4)(1,4)(1, -4) \rightarrow (-1, -4)

Final coordinates of figure E:

Thus, the coordinates of figure E are:

  • (2,1)(-2, -1)
  • (3,1)(-3, -1)
  • (5,3)(-5, -3)
  • (1,4)(-1, -4)

Would you like more details or have any questions?

Here are 5 related questions:

  1. What are the coordinates if figure D were reflected over the x-axis instead of the y-axis?
  2. How would the coordinates change if the rotation was counterclockwise instead of clockwise?
  3. Can a translation be combined with rotation and reflection to form a new transformation?
  4. How do you determine if two figures are congruent through transformations?
  5. What happens if you apply two reflections to a figure—one over the x-axis and one over the y-axis?

Tip: When rotating figures, it's helpful to visualize how the points move quadrant by quadrant to avoid confusion with sign changes.

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Transformations
Rotations
Reflections

Formulas

90-degree clockwise rotation: (x, y) → (y, -x)
Reflection over y-axis: (x, y) → (-x, y)

Theorems

Congruence through rigid transformations

Suitable Grade Level

Grades 8-10