Math Problem Statement

What is the image of the point left parenthesis, minus, 7, comma, 5, right parenthesis(−7,5) after a rotation of 180, degrees180 ∘ counterclockwise about the origin?

Solution

To determine the image of the point (7,5)(-7, 5) after a 180180^\circ counterclockwise rotation about the origin, we use the following rule for a 180180^\circ rotation:

(x,y)(x,y)(x, y) \to (-x, -y)

Applying the rule:

Given the point (7,5)(-7, 5):

  • The xx-coordinate becomes (7)=7-(-7) = 7,
  • The yy-coordinate becomes (5)=5-(5) = -5.

Result:

The image of the point after the rotation is:

(7,5)(7, -5)

Would you like additional details or clarification?

Here are 5 related questions to expand your understanding:

  1. How do other rotation angles, such as 9090^\circ or 270270^\circ, transform points?
  2. How would this change if the rotation occurred about a different point (not the origin)?
  3. What are the properties of transformations like rotations (e.g., do they preserve distance)?
  4. How would the transformation affect a geometric shape rather than just a point?
  5. What is the relationship between clockwise and counterclockwise rotations?

Tip: Always sketch a coordinate grid for visualization—it makes rotations much easier to comprehend!

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Transformations
Rotations

Formulas

(x, y) → (-x, -y) for a 180° rotation about the origin

Theorems

Properties of rotations (distance and angle preservation)

Suitable Grade Level

Grades 8-10