Math Problem Statement

Triangle ABC will be reflected over the y-axis. What will be the coordinates of A'B'C'?

Solution

The problem involves reflecting triangle ABC over the y-axis. To find the coordinates of the reflected triangle, we need to apply the rule for reflecting points over the y-axis:

  • For a point (x,y)(x, y), its reflection over the y-axis will be (x,y)(-x, y).

Let’s apply this to each vertex of triangle ABC.

  • Point A is at (2,5)(-2, 5). Its reflection, AA', will be at (2,5)(2, 5).
  • Point B is at (3,3)(3, -3). Its reflection, BB', will be at (3,3)(-3, -3).
  • Point C is at (4,1)(4, -1). Its reflection, CC', will be at (4,1)(-4, -1).

Therefore, the coordinates of the reflected triangle A'B'C' are:

  • A(2,5)A'(2, 5),
  • B(3,3)B'(-3, -3),
  • C(4,1)C'(-4, -1).

The correct answer is A(2,5),B(3,3),C(4,1)A'(2, 5), B'(-3, -3), C'(-4, -1), which corresponds to the third option in the list.

Do you want further details on reflections, or have any questions?


Here are 5 related questions to practice:

  1. What are the coordinates of a point (4,6)(4, -6) reflected over the x-axis?
  2. How do the coordinates change when reflecting a point over the origin?
  3. What is the rule for reflecting a point over the line y=xy = x?
  4. Can a triangle be mapped to itself by reflection? Under what conditions?
  5. What is the result of reflecting a triangle over both the x-axis and the y-axis?

Tip: When reflecting over the y-axis, only the x-coordinate changes sign, while the y-coordinate remains the same.

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Math Problem Analysis

Mathematical Concepts

Geometry
Coordinate Geometry
Reflections

Formulas

For a point (x, y), its reflection over the y-axis is (-x, y)

Theorems

Reflection Theorem in Coordinate Geometry

Suitable Grade Level

Grades 7-9