Math Problem Statement

Triangle ABC, shown on the coordinate grid, is rotated 180° about the origin and then translated 1 unit to the right to form Triangle A'B'C'. Which statements are true?

Solution

The problem describes a transformation of triangle ABCABC that involves a 180° rotation about the origin followed by a translation 1 unit to the right, forming triangle ABCA'B'C'.

Let's break down the transformation and solve for the true statements.

1. 180° Rotation about the Origin:

  • The rule for a 180° rotation is: (x,y)(x,y)(x, y) \rightarrow (-x, -y).

2. Translation 1 Unit to the Right:

  • The translation rule: After rotation, the transformation adds 1 to the x-coordinate, meaning (x,y)(x+1,y)(x, y) \rightarrow (x + 1, y).

Let's now verify each statement:

A) The transformation is given by (x,y)(x1,y)(x, y) \rightarrow (x - 1, -y):

  • This is incorrect because the rule for 180° rotation is (x,y)(x,y)(x, y) \rightarrow (-x, -y), and the translation moves the point right, so the correct transformation includes an addition to the x-coordinate, not a subtraction.

B) The transformation is given by (x,y)(x+1,y)(x, y) \rightarrow (-x + 1, -y):

  • This is correct. After a 180° rotation, we apply (x,y)(-x, -y) and then shift 1 unit right, giving (x+1,y)(-x + 1, -y).

C) The coordinates of CC' are (2, 2):

  • Let's verify by first applying the transformations to point CC.
    • C(4,3)(4,3)C(-4, -3) \rightarrow (4, 3) after 180° rotation.
    • Then, translate 1 unit right: (4,3)(5,3)(4, 3) \rightarrow (5, 3).
    • So, the coordinates of CC' are (5,3)(5, 3), not (2,2)(2, 2). This statement is incorrect.

D) The coordinates of BB' are (1, -2):

  • Let's check point BB:
    • B(1,3)(1,3)B(-1, 3) \rightarrow (1, -3) after 180° rotation.
    • Then, translate 1 unit right: (1,3)(2,3)(1, -3) \rightarrow (2, -3).
    • So, the coordinates of BB' are (2,3)(2, -3), not (1,2)(1, -2). This statement is incorrect.

E) The coordinates of AA' are (3, -3):

  • Let's check point AA:
    • A(3,4)(3,4)A(-3, 4) \rightarrow (3, -4) after 180° rotation.
    • Then, translate 1 unit right: (3,4)(4,4)(3, -4) \rightarrow (4, -4).
    • So, the coordinates of AA' are (4,4)(4, -4), not (3,3)(3, -3). This statement is incorrect.

Conclusion:

The only correct statement is B). The transformation is given by (x,y)(x+1,y)(x, y) \rightarrow (-x + 1, -y).

Would you like more details or clarification on any part? Here are some follow-up questions to explore further:

  1. How do different types of transformations (rotations, reflections) change coordinates?
  2. What is the general rule for translating points in the coordinate plane?
  3. How does a 180° rotation affect points symmetrically?
  4. Can you apply the transformations to other figures, such as quadrilaterals?
  5. How would the transformation change if it involved reflection instead of rotation?

Tip: Always remember to apply transformations step by step, especially when dealing with multiple operations like rotations and translations!

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Transformations
Rotations
Translations

Formulas

180° rotation: (x, y) → (-x, -y)
Translation 1 unit right: (x, y) → (x + 1, y)

Theorems

Rotation and Translation Theorems

Suitable Grade Level

Grades 8-10