Math Problem Statement

The point (-2, -3) is rotated 90 degrees counterclockwise using center (0, 0). What are the coordinates of the image?

Solution

To solve the problem of rotating the point (2,3)(-2, -3) 90 degrees counterclockwise around the origin (0,0)(0, 0), we can use the following rotation formula for a 90° counterclockwise rotation:

(x,y)=(y,x)(x', y') = (-y, x)

Given the point (2,3)(-2, -3):

  • The xx-coordinate is 2-2 and the yy-coordinate is 3-3.
  • After applying the formula:
    • The new xx'-coordinate becomes (3)=3-(-3) = 3,
    • The new yy'-coordinate becomes 2-2.

Thus, the rotated point is (3,2)(3, -2).

The correct answer is C: (3, -2).

Would you like further details or have any questions?

Here are 5 related questions to expand on this concept:

  1. What is the formula for rotating a point 180 degrees about the origin?
  2. How would the coordinates change if the point was rotated 90 degrees clockwise instead?
  3. Can you describe how rotation transformations preserve distances and angles?
  4. How can you use matrices to represent and compute rotations?
  5. What happens to a point if it's rotated by 360 degrees?

Tip: When rotating a point, the sign changes based on the direction and angle of rotation. Understanding the formula helps to predict these changes accurately.

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Rotations

Formulas

(x', y') = (-y, x)

Theorems

Rotation theorem

Suitable Grade Level

Grades 8-10