self-similar snowflakes with optional fractal...
TRANSCRIPT
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Self-Similar Snowflakes with Optional Fractal Extension Elizabeth Untiedt
Mathematics
OBJECTIVE, BACKGROUND INFORMATION, & REFERENCES
Standards Met:
Algebra:
Represent, describe, and analyze patterns and relationships using tables, graphs, verbal rules, and standard algebraic notation
Analyze functional relationships to explain how a change in one quantity results in a change in another
Geometry and Measurement:
Make and test conjectures about geometric shapes and their properties, incorporating technology where appropriate
Apply the concept of ratio, proportion and similarity in problem-solving situations
Describe, analyze and reason informally about the properties (for example, parallelism, perpendicularity, congruence) of two- and three-dimensional figures
Background: We have just finished studying similarity in geometry. This lesson expands on that concept by exploring the concept of self-similarity: shapes with parts which are similar to the whole. We learn about the iterative patterns and fractional measurements that are used in creating these shapes. Reference: Craig Tennenhouse, http://upload.wikimedia.org/wikipedia/commons/a/ae/Cauliflower_Fractal_AVM.JPG http://upload.wikimedia.org/wikipedia/en/2/25/Kochsim2.gif http://upload.wikimedia.org/wikipedia/commons/f/fd/Von_Koch_curve.gif http://www.cs.unm.edu/~joel/PaperFoldingFractal/ http://math.rice.edu/~lanius/frac/index.html http://classes.yale.edu/fractals/Labs/PaperFoldingLab/paperFoldingLab.html http://en.wikipedia.org/wiki/Sierpinski_triangle http://www.coolmath.com/fractals/fractalgenerators/generator1/index.html
VOCABULARY, MATERIALS, PREPARATION, SAFETY
Vocabulary: Self-similarity, iterative process, fractional dimension
Materials: Part 1- 4x6 cardstock; scissors; rulers; protracters Part 2- Scissors, white paper, construction paper, glue, computers, rulers, protracters, meter sticks, butcher paper Preparation: Create sample snowflakes.
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Self-Similar Snowflakes with Optional Fractal Extension Elizabeth Untiedt
Mathematics
5 E’S
Describe how each of the 5 E’s will be accomplished:
Engage: Self-similarity presentation, including self-similarity in nature, in video games and in CGI.
Explore: Using protracters and rulers, students create Koch Snowflakes on cardstock by using an iterative
process. This is a level 4 snowflake. Some students made level 4 and some made level 3. Explain: This self-similar shape (like all man-made self-similar shapes!) is made by an iterative process. Each students started with an equilateral triangle (iteration zero). They add equilateral triangles in the center of each segment for Iteration 1. At each successive iteration they perform the same process (adding equilateral triangles in the center of every segment.) Elaborate: Students are encouraged to add another level to their snowflake or create more at home. In addition, the geometry students have another block period in which they engage in 3 different elaboration stations.
1- Computer generated fractals. Students set the parameters and explore the various shapes they can produce.
2- Large fractals. Students work in groups of two to four to create one of the following very large fractals on butcher paper.
QuickTime™ and a decompressor
are needed to see this picture.
Sierpinski Triangle Sierpinski Carpet Anti-snowflake H-tree 3- Folded paper station: Students use an iterative process of cutting and folding to create self-similar
paper sculptures from white paper and glue them to colored paper.
Evaluate: Questions on worksheet to show that students understand the underlying patterns of fractal growth. In particular, they answered questions that show the geometric growth of the number of triangles and the segment lengths on the Koch Snowflake.
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Self-Similar Snowflakes with Optional Fractal Extension Elizabeth Untiedt
Mathematics
PEER REVIEW COMMENTS Craig Tennenhouse reviewed the lesson and gave me advice on pre-installing fractal software on the computers.
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Self-SimilarityAn Extension of Similarity
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We know all about similar shapes….
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What are self-similar shapes?
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What are self-similar shapes?
Shapes that are similar to themselves
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What are self-similar shapes?
Shapes that are similar to themselves
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What are self-similar shapes?
Shapes that are similar to themselves
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What are self-similar shapes?
Shapes that are similar to themselves
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Example of self-similar shape:
Bransley’s Fern
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Example of self-similar shape:
Bransley’s Fern
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Example of self-similar shape:
Bransley’s Fern
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Example of self-similar shape:
Bransley’s Fern
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Example of self-similar shape:
Bransley’s Fern
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Example of self-similar shape:
Serpinski Triangle
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Example of self-similar shape:
Sierpenski Triangle
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Example of self-similar shape:
Sierpenski Triangle
And we could keep zooming in forever…
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Example of self-similar shape:
Sierpenski Triangle
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SierpenskiTriangle:
How many triangles are there at each
stage?
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Self-Similarity in Nature:Cauliflower
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Self-Similarity in Nature:Queen Anne’s Lace
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Self-Similarity in Nature:Tree
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Our Project Today: Koch Snowflake
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Koch Snowflake: No matter how much you zoom in, it looks the same
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FractalsAn Extension of Self-Similarity
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Fractals have three main features:
Self-similarity
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Fractals have three main features:
Self-similarity
Iterative Process
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Fractals have three main features:
Self-similarity
Iterative Process
Fractional Dimension
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What is a Fractional Dimension?
0-dimension: point
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Dimensions
0-dimension: point
1-dimension: line
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Dimensions
0-dimension: point
1-dimension: line
2-dimension: plane
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Dimensions
0-dimension: point
1-dimension: line
2-dimension: plane
3-dimension: space
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Dimensions
0-dimension: point
1-dimension: line
2-dimension: plane
3-dimension: space
What would a 1.3 dimensional object look like?
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Dimensions and Doubling
1-dimensional: two copies
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Dimensions and Doubling
1-dimensional: two copies
2-dimensional: four copies
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Dimensions and Doubling
1-dimensional: two copies
2-dimensional: four copies
3-dimensional: eight copies
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Dimensions and Doubling
1-dimensional: two copies
2-dimensional: four copies
3-dimensional: eight copies
21
2
2
2
3
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Doubling Sierpinski
How many copies do we get?
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Doubling Sierpinski
How many copies do we get?
If we can find x so that 2 =3then Sierpinski is x-dimensional
x
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We’ve seen fractals in nature…
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We’ve seen fractals in nature…
Now for fractals in math
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Mandelbrot Set
If you can get all the way to z-infinity without it equalling infinity, then xis IN the Mandelbrot set.
If you can’t get all the way to z-infinity without it equalling infinity, then xis out of the Mandelbrot set.
Based on an iterative formula.
Start with some x.
z1= x.
z2= z1 + x.
z3 = z2 + x.
Etc.
2
2
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Self-Similarity in the Mandelbrot Set
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Self-Similarity in the Mandelbrot Set
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Fractal Stations:
1. Computers:http://www.coolmath.com/fractals/fractalgenerator
s/generator1/index.htmlhttp://www.cs.unm.edu/~joel/PaperFoldingFractal
/
1. Large Fractals
1. Folded Fractals
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Fractal Stations:
1. Computers
1. Large Fractals
1. Folded Fractals
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Paper Folding
1. Computers:
1. Large Fractals
1. Folded Fractals
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