Math Problem Statement

Which triangle is the image of ΔA after each transformation? List the image after each transformation.

Solution

Let's solve each transformation for triangle ΔA\Delta A based on the provided instructions and diagram.

Triangle ΔA\Delta A's initial position:

  • The coordinates of triangle ΔA\Delta A appear to be approximately (5,2)(5, 2), (7,2)(7, 2), and (6,4)(6, 4).

1. Reflection over y=1y = -1:

  • A reflection over y=1y = -1 inverts points across the line y=1y = -1. The vertical distance from each point of ΔA\Delta A to the line y=1y = -1 is calculated and mirrored across.
  • The result should give the image as ΔC\Delta C (the triangle on the left, below the x-axis).

2. Rotation 180180^\circ about the origin:

  • A 180180^\circ rotation inverts all points through the origin. The transformation rule is (x,y)(x,y)(x, y) \to (-x, -y).
  • Applying this to each vertex of ΔA\Delta A, the new image lands at triangle ΔE\Delta E (located in the bottom-right quadrant).

3. Translation by (x+3,y+2)(x + 3, y + 2):

  • Each vertex of ΔA\Delta A is moved 3 units right and 2 units up.
  • After applying this, triangle ΔA\Delta A maps to ΔG\Delta G (the triangle near the top right).

4. Reflection over x=5x = 5:

  • A reflection over the vertical line x=5x = 5 flips points horizontally across x=5x = 5. The distances from each point of ΔA\Delta A to the line are measured and inverted.
  • This transformation results in triangle ΔD\Delta D (the triangle to the top-left of ΔA\Delta A).

Summary of transformations:

  • ΔA\Delta A reflected over y=1y = -1ΔC\Delta C
  • ΔA\Delta A rotated 180180^\circ about the origin → ΔE\Delta E
  • ΔA\Delta A translated by (x+3,y+2)(x + 3, y + 2)ΔG\Delta G
  • ΔA\Delta A reflected over x=5x = 5ΔD\Delta D

Would you like further details on any of these transformations?


Here are 5 related questions you might explore:

  1. How do you determine the reflection of a point across any given line?
  2. What is the effect of a 9090^\circ rotation compared to a 180180^\circ rotation?
  3. How does translating a figure affect its orientation and size?
  4. Can reflections across non-horizontal or non-vertical lines be calculated similarly?
  5. How can you identify rotational symmetries in other shapes, like polygons?

Tip: To verify transformations, it can help to sketch out the original and transformed figures step by step on graph paper!

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Math Problem Analysis

Mathematical Concepts

Geometric Transformations
Reflections
Rotations
Translations
Coordinate Geometry

Formulas

Reflection over a line y = m
Rotation formula (180 degrees) about origin: (x, y) → (-x, -y)
Translation formula: (x + a, y + b)

Theorems

Reflection Theorem: A reflection over a line produces a mirror image.
Rotation Theorem: A 180-degree rotation about the origin reverses the coordinates.

Suitable Grade Level

Grades 8-10