Math Problem Statement

The rectangle shown below undergoes a dilation with a scale factor of 1/4. What is the perimeter of the image?

Solution

The problem in the image asks to find the perimeter of a rectangle after it undergoes a dilation with a scale factor of 14\frac{1}{4}.

Given:

  • Original dimensions of the rectangle:
    • Length = 12 inches
    • Width = 4 inches
  • Scale factor = 14\frac{1}{4}

Step 1: Find the new dimensions

The dilation with a scale factor of 14\frac{1}{4} will reduce each dimension by that factor.

  • New length = 14×12=3\frac{1}{4} \times 12 = 3 inches
  • New width = 14×4=1\frac{1}{4} \times 4 = 1 inch

Step 2: Calculate the perimeter

The formula for the perimeter of a rectangle is: P=2×(length+width)P = 2 \times (\text{length} + \text{width}) Substitute the new dimensions: P=2×(3+1)=2×4=8 inchesP = 2 \times (3 + 1) = 2 \times 4 = 8 \text{ inches}

Final Answer:

The perimeter of the image after the dilation is 8 inches.

Would you like further details on how dilation works or any related topics?

Related Questions:

  1. How would the area of the rectangle change after the dilation?
  2. What happens to the perimeter if the scale factor is 12\frac{1}{2} instead of 14\frac{1}{4}?
  3. How does the scale factor affect shapes that are not rectangles, like circles or triangles?
  4. If the original rectangle had a diagonal of 13 inches, what would the diagonal be after the dilation?
  5. Can a dilation increase the size of a shape? What would the perimeter be if the scale factor were 2?

Tip:

When working with dilations, always remember that the scale factor applies uniformly to all dimensions of the shape, and it directly affects both perimeter and area differently!

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Math Problem Analysis

Mathematical Concepts

Geometry
Dilation
Perimeter

Formulas

Perimeter of a rectangle P = 2 × (length + width)
Dilation formula: new dimension = original dimension × scale factor

Theorems

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Suitable Grade Level

Grades 6-8