Math Problem Statement

What are the coordinates for point A' after applying a dilation to triangle ABC with a center at (2,3) and a scale factor of 1/4?

Solution

The image shows a problem involving the dilation of triangle ΔABC\Delta ABC to triangle ΔABC\Delta A'B'C' using a dilation factor and a center of dilation.

Given Information:

  • Dilation Center: (2,3)(2, 3)
  • Dilation Factor: 14\frac{1}{4}

The goal is to find the coordinates of point AA', the image of point AA, after dilation.

Steps to Solve:

  1. Identify Coordinates of Point A: Based on the grid, the coordinates of point AA are approximately (2,6)(-2, 6).

  2. Apply Dilation Formula: The formula for dilation is: A(x,y)=(xc+k(xxc),yc+k(yyc))A'(x', y') = (x_c + k(x - x_c), y_c + k(y - y_c)) where:

    • (xc,yc)(x_c, y_c) is the center of dilation
    • (x,y)(x, y) is the original point (in this case, point AA)
    • kk is the dilation factor

    For point AA, with coordinates (2,6)(-2, 6), center (2,3)(2, 3), and factor k=14k = \frac{1}{4}: x=2+14(22)=2+14(4)=21=1x' = 2 + \frac{1}{4}(-2 - 2) = 2 + \frac{1}{4}(-4) = 2 - 1 = 1 y=3+14(63)=3+14(3)=3+0.75=3.75y' = 3 + \frac{1}{4}(6 - 3) = 3 + \frac{1}{4}(3) = 3 + 0.75 = 3.75

So, the coordinates of AA' are (1,3.75)(1, 3.75).

Let me know if you'd like further details or explanations! Here are five related questions to explore:

  1. How would the dilation formula change if the center of dilation was not given?
  2. How would you find the coordinates of points BB' and CC' after dilation?
  3. How does the size of the dilation factor affect the resulting triangle's size?
  4. What is the difference between dilation and other transformations like translation or rotation?
  5. Can a dilation change the shape of a figure, or only its size?

Tip: Always remember that dilation affects distances between points, scaling them by the dilation factor relative to the center of dilation.

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Math Problem Analysis

Mathematical Concepts

Geometry
Coordinate Geometry
Dilation
Transformations

Formulas

Dilation formula: A'(x', y') = (x_c + k(x - x_c), y_c + k(y - y_c))

Theorems

Dilation Theorem

Suitable Grade Level

Grades 8-10