Math Problem Statement

Find the composition of transformations that map ABCD to A'B'C'D'. The instructions provided indicate: 'Rotate clockwise about the origin [ ? ]°, then reflect over the [ ]-axis.'

Solution

To determine the composition of transformations that map the rectangle ABCDABCD to ABCDA'B'C'D', we need to analyze the steps provided:

  1. Rotation: The first transformation mentioned is a clockwise rotation about the origin. Based on the positions of ABCDABCD and ABCDA'B'C'D', it seems that the figure has been rotated 90° clockwise. In general, a 90° clockwise rotation about the origin transforms the coordinates (x,y)(x, y) to (y,x)(y, -x).

    Let’s check:

    • A(5,6)A(6,5)A(-5, 6) \rightarrow A'(6, -5)
    • B(3,6)B(6,3)B(-3, 6) \rightarrow B'(6, -3)
    • C(3,2)C(2,3)C(-3, 2) \rightarrow C'(2, -3)
    • D(5,2)D(2,5)D(-5, 2) \rightarrow D'(2, -5)

    All points confirm a 90° clockwise rotation.

  2. Reflection: The second transformation is a reflection. After the 90° rotation, the figure is reflected over the x-axis, because the signs of the y-coordinates in the final positions of ABCDA'B'C'D' are opposite to those in the rotated version.

Thus, the composition of transformations is:

  • Rotate 90° clockwise about the origin.
  • Reflect over the x-axis.

Would you like a more detailed breakdown or further clarification?

Here are 5 related questions you can explore:

  1. What are the rules for other common rotations (e.g., 180°, 270°) about the origin?
  2. How would the transformation change if reflected over the y-axis instead of the x-axis?
  3. What are the formulas for reflections over other lines, like y=xy = x or y=xy = -x?
  4. How does the order of transformations (e.g., reflecting first, then rotating) affect the result?
  5. How would you find the image of a point under a combination of dilation and rotation?

Tip: Always apply transformations step-by-step, checking each point to ensure accuracy in composite transformations.

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Math Problem Analysis

Mathematical Concepts

Transformations
Rotation
Reflection
Coordinate Geometry

Formulas

Rotation formula: A 90° clockwise rotation maps (x, y) to (y, -x).
Reflection formula over the x-axis: (x, y) maps to (x, -y).

Theorems

Properties of transformations: Rotation followed by reflection.

Suitable Grade Level

Grades 8-10