Math Problem Statement

Polygon ABCD with vertices at A(−4, 6), B(−2, 2), C(4, −2), and D(4, 4) is dilated using a scale factor of 3/5 to create polygon A′B′C′D′. If the dilation is centered at the origin, determine the vertices of polygon A′B′C′D′.

Solution

To determine the vertices of polygon ABCDA'B'C'D', which is a dilation of polygon ABCDABCD with a scale factor of 35\frac{3}{5}, we will apply the dilation formula to each vertex. The formula for dilation centered at the origin is:

(x,y)=(kx,ky)(x', y') = \left( k \cdot x, k \cdot y \right) where kk is the scale factor, and (x,y)(x, y) are the coordinates of the original vertex.

Given that k=35k = \frac{3}{5}, we will apply this formula to each vertex of polygon ABCDABCD.

Step-by-Step Calculation for Each Vertex:

  1. Vertex A(4,6)A(-4, 6): A=(354,356)=(2.4,3.6)A' = \left( \frac{3}{5} \cdot -4, \frac{3}{5} \cdot 6 \right) = (-2.4, 3.6)

  2. Vertex B(2,2)B(-2, 2): B=(352,352)=(1.2,1.2)B' = \left( \frac{3}{5} \cdot -2, \frac{3}{5} \cdot 2 \right) = (-1.2, 1.2)

  3. Vertex C(4,2)C(4, -2): C=(354,352)=(2.4,1.2)C' = \left( \frac{3}{5} \cdot 4, \frac{3}{5} \cdot -2 \right) = (2.4, -1.2)

  4. Vertex D(4,4)D(4, 4): D=(354,354)=(2.4,2.4)D' = \left( \frac{3}{5} \cdot 4, \frac{3}{5} \cdot 4 \right) = (2.4, 2.4)

Final Coordinates of Polygon ABCDA'B'C'D':

  • A(2.4,3.6)A'(-2.4, 3.6)
  • B(1.2,1.2)B'(-1.2, 1.2)
  • C(2.4,1.2)C'(2.4, -1.2)
  • D(2.4,2.4)D'(2.4, 2.4)

These are the vertices of polygon ABCDA'B'C'D' after the dilation with a scale factor of 35\frac{3}{5} centered at the origin.

Would you like more details or have any questions?

Here are 5 related questions to explore:

  1. What happens if the dilation is centered at a point other than the origin?
  2. How would the scale factor change if you wanted the image to be larger than the original?
  3. What is the effect of a negative scale factor in dilation?
  4. How do you calculate the area of the dilated polygon?
  5. How does dilation affect the slopes of the lines connecting the vertices?

Tip: Remember that in a dilation centered at the origin, all points on the figure move along a straight line from the origin according to the scale factor.

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Math Problem Analysis

Mathematical Concepts

Geometry
Dilation

Formulas

Dilation formula: (x', y') = (k * x, k * y)

Theorems

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Suitable Grade Level

High School