Math Problem Statement
What is the image of the point left parenthesis, 8, comma, 7, right parenthesis(8,7) after a rotation of 90, degrees90 ∘ counterclockwise about the origin?
Solution
To find the image of the point after a 90° counterclockwise rotation about the origin, we use the following rule for rotations:
If a point is rotated 90° counterclockwise about the origin, its new coordinates become:
Step-by-Step Solution:
- The original point is , so and .
- Applying the formula for 90° counterclockwise rotation:
Final Answer:
The image of the point after a 90° counterclockwise rotation about the origin is .
Would you like a detailed explanation or any clarifications on this process? Here are some related questions you might find helpful:
- What is the image of after a 180° rotation?
- How do you perform a 270° counterclockwise rotation about the origin?
- What is the general formula for rotating any point by 90° clockwise?
- How would the coordinates change if the point was reflected across the y-axis instead of rotated?
- Can you explain how to rotate a point by 45° counterclockwise?
Tip: Always remember that a 90° counterclockwise rotation switches the coordinates and changes the sign of the original -coordinate.
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Math Problem Analysis
Mathematical Concepts
Coordinate Geometry
Rotations
Transformations
Formulas
(x', y') = (-y, x) for 90° counterclockwise rotation
Theorems
Rotation theorem about the origin
Suitable Grade Level
Grades 8-10
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