Math Problem Statement

What is the image of the point left parenthesis, minus, 7, comma, minus, 8, right parenthesis(−7,−8) after a rotation of 270, degrees270∘ counterclockwise about the origin?

Solution

To find the image of the point (7,8)(-7, -8) after a rotation of 270° counterclockwise about the origin, we can use the standard formula for rotating a point (x,y)(x, y) by an angle θ\theta around the origin. The formulas for rotations are:

  • A 90° counterclockwise rotation: (x,y)(y,x)(x, y) \rightarrow (-y, x)
  • A 180° counterclockwise rotation: (x,y)(x,y)(x, y) \rightarrow (-x, -y)
  • A 270° counterclockwise rotation: (x,y)(y,x)(x, y) \rightarrow (y, -x)

For a 270° counterclockwise rotation, we apply the formula (x,y)(y,x)(x, y) \rightarrow (y, -x).

Given the point (7,8)(-7, -8):

  • x=7x = -7
  • y=8y = -8

Using the formula for a 270° counterclockwise rotation: (x,y)(y,x)(x, y) \rightarrow (y, -x) So the new coordinates will be: (8,7)(-8, 7)

Therefore, the image of the point (7,8)(-7, -8) after a 270° counterclockwise rotation about the origin is (8,7)(-8, 7).

Would you like further details or clarifications? Here are some related questions you might find interesting:

  1. How do the formulas for rotation change for other angles like 90° or 180°?
  2. What would the point (4,3)(4, 3) become after a 270° counterclockwise rotation?
  3. How can we verify the result of a rotation using the distance formula?
  4. What is the geometric significance of a 270° rotation in terms of the point's path?
  5. How do you rotate a point by any arbitrary angle, not just multiples of 90°?

Tip: Always remember that counterclockwise rotations are positive, while clockwise rotations are negative!

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Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Rotations

Formulas

(x, y) → (-y, x) for 90° counterclockwise rotation
(x, y) → (-x, -y) for 180° counterclockwise rotation
(x, y) → (y, -x) for 270° counterclockwise rotation

Theorems

Rotation of points around the origin

Suitable Grade Level

Grades 8-10