Math Problem Statement

Rectangle ABCD is shown on the coordinate plane below. If a dilation image of Rectangle ABCD with the origin as the center of dilation and a scale factor of 2, which ordered pair would NOT be a vertex of this dilation?

Solution

The problem asks for the ordered pair that would NOT be a vertex after dilation of rectangle ABCD, centered at the origin, with a scale factor of 2.

Step 1: Identify original coordinates of ABCD

Looking at the grid, we can estimate the coordinates of each vertex of rectangle ABCD:

  • A=(2,1)A = (-2, -1)
  • B=(2,1)B = (-2, 1)
  • C=(2,1)C = (2, 1)
  • D=(2,1)D = (2, -1)

Step 2: Apply dilation

The dilation formula with the origin as the center and a scale factor of 2 is: (x,y)=(2x,2y)(x', y') = (2x, 2y) Apply this to each vertex:

  • A=(2×2,2×1)=(4,2)A' = (2 \times -2, 2 \times -1) = (-4, -2)
  • B=(2×2,2×1)=(4,2)B' = (2 \times -2, 2 \times 1) = (-4, 2)
  • C=(2×2,2×1)=(4,2)C' = (2 \times 2, 2 \times 1) = (4, 2)
  • D=(2×2,2×1)=(4,2)D' = (2 \times 2, 2 \times -1) = (4, -2)

Step 3: Check options

Now compare the given options:

  • (10, -2) → Not a vertex
  • (-2, 2) → Not a vertex
  • (-2, 10) → Not a vertex
  • (10, 10) → Not a vertex

None of these match the vertices after dilation.

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Math Problem Analysis

Mathematical Concepts

Geometry
Coordinate Geometry
Transformations
Dilation

Formulas

Dilation formula: (x', y') = (kx, ky), where k is the scale factor

Theorems

Properties of dilation with respect to the origin

Suitable Grade Level

Grades 8-10